Package gov.nist.javax.sip.stack

Examples of gov.nist.javax.sip.stack.SIPServerTransaction


      throw new SipException("Stack is stopped");
    SIPResponse sipResponse = (SIPResponse) response;
    Via via = sipResponse.getTopmostVia();
    if (via == null)
      throw new SipException("No via header in response!");
    SIPServerTransaction st = (SIPServerTransaction) sipStack.findTransaction((SIPMessage)response, true);
    if ( st != null   && st.getState() != TransactionState.TERMINATED) {
      throw new SipException("Transaction exists -- cannot send response statelessly");
    }
    String transport = via.getTransport();

    // check to see if Via has "received paramaeter". If so
View Full Code Here


    SIPDialog dialog = null;
    SIPTransaction sipTransaction = (SIPTransaction) transaction;

    if (transaction instanceof ServerTransaction) {
      SIPServerTransaction st = (SIPServerTransaction) transaction;
      Response response = st.getLastResponse();
      if (response != null) {
        if (response.getStatusCode() != 100)
          throw new SipException(
              "Cannot set dialog after response has been sent");
      }
View Full Code Here

            throws TransactionAlreadyExistsException,
            TransactionUnavailableException {

        if (!sipStack.isAlive())
            throw new TransactionUnavailableException("Stack is stopped");
        SIPServerTransaction transaction = null;
        SIPRequest sipRequest = (SIPRequest) request;
        try {
            sipRequest.checkHeaders();
        } catch (ParseException ex) {
            throw new TransactionUnavailableException(ex.getMessage(), ex);
        }

        if ( request.getMethod().equals(Request.ACK)) {
            if ( logger.isLoggingEnabled())
                logger.logError("Creating server transaction for ACK -- makes no sense!");
            throw new TransactionUnavailableException("Cannot create Server transaction for ACK ");
        }
        /*
         * Got a notify.
         */
        if (sipRequest.getMethod().equals(Request.NOTIFY)
                && sipRequest.getFromTag() != null
                && sipRequest.getToTag() == null) {

            SIPClientTransaction ct = sipStack.findSubscribeTransaction(
                    sipRequest, (ListeningPointImpl) this.getListeningPoint());
            /* Issue 104 */
            if (ct == null && ! sipStack.isDeliverUnsolicitedNotify()) {
                throw new TransactionUnavailableException(
                        "Cannot find matching Subscription (and gov.nist.javax.sip.DELIVER_UNSOLICITED_NOTIFY not set)");
            }
        }
        if ( !sipStack.acquireSem()) {
            throw new TransactionUnavailableException(
            "Transaction not available -- could not acquire stack lock");
        }
        try {
            if (SIPTransactionStack.isDialogCreated(sipRequest.getMethod())) {
                if (sipStack.findTransaction((SIPRequest) request, true) != null)
                    throw new TransactionAlreadyExistsException(
                    "server transaction already exists!");

                transaction = (SIPServerTransaction) ((SIPRequest) request)
                .getTransaction();
                if (transaction == null)
                    throw new TransactionUnavailableException(
                    "Transaction not available");
                if (transaction.getOriginalRequest() == null)
                    transaction.setOriginalRequest(sipRequest);
                try {
                    sipStack.addTransaction(transaction);
                } catch (IOException ex) {
                    throw new TransactionUnavailableException(
                    "Error sending provisional response");
                }
                // So I can handle timeouts.
                transaction.addEventListener(this);
                if (isAutomaticDialogSupportEnabled()) {
                    // If automatic dialog support is enabled then
                    // this tx gets his own dialog.
                    String dialogId = sipRequest.getDialogId(true);
                    SIPDialog dialog = sipStack.getDialog(dialogId);
                    if (dialog == null) {
                        dialog = sipStack.createDialog(transaction);

                    }
                    transaction.setDialog(dialog, sipRequest.getDialogId(true));
                    if (sipRequest.getMethod().equals(Request.INVITE) && this.isDialogErrorsAutomaticallyHandled()) {
                        sipStack.putInMergeTable(transaction, sipRequest);
                    }
                    dialog.addRoute(sipRequest);
                    if (dialog.getRemoteTag() != null
                            && dialog.getLocalTag() != null) {
                        this.sipStack.putDialog(dialog);
                    }
                }

            } else {
                if (isAutomaticDialogSupportEnabled()) {
                    /*
                     * Under automatic dialog support, dialog is tied into a transaction. You cannot
                     * create a server tx except for dialog creating transactions. After that, all
                     * subsequent transactions are created for you by the stack.
                     */
                    transaction = (SIPServerTransaction) sipStack.findTransaction(
                            (SIPRequest) request, true);
                    if (transaction != null)
                        throw new TransactionAlreadyExistsException(
                        "Transaction exists! ");
                    transaction = (SIPServerTransaction) ((SIPRequest) request)
                    .getTransaction();
                    if (transaction == null)
                        throw new TransactionUnavailableException(
                        "Transaction not available!");
                    if (transaction.getOriginalRequest() == null)
                        transaction.setOriginalRequest(sipRequest);
                    // Map the transaction.
                    try {
                        sipStack.addTransaction(transaction);
                    } catch (IOException ex) {
                        throw new TransactionUnavailableException(
                        "Could not send back provisional response!");
                    }

                    // If there is a dialog already assigned then just update the
                    // dialog state.
                    String dialogId = sipRequest.getDialogId(true);
                    SIPDialog dialog = sipStack.getDialog(dialogId);
                    if (dialog != null) {
                        dialog.addTransaction(transaction);
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, sipRequest.getDialogId(true));
                    }

                } else {
                    transaction = (SIPServerTransaction) sipStack.findTransaction(
                            (SIPRequest) request, true);
                    if (transaction != null)
                        throw new TransactionAlreadyExistsException(
                        "Transaction exists! ");
                    transaction = (SIPServerTransaction) ((SIPRequest) request)
                    .getTransaction();
                    if (transaction != null) {
                        if (transaction.getOriginalRequest() == null)
                            transaction.setOriginalRequest(sipRequest);
                        // Map the transaction.
                        sipStack.mapTransaction(transaction);

                        // If there is a dialog already assigned then just
                        // assign the dialog to the transaction.
                        String dialogId = sipRequest.getDialogId(true);
                        SIPDialog dialog = sipStack.getDialog(dialogId);
                        if (dialog != null) {
                            dialog.addTransaction(transaction);
                            dialog.addRoute(sipRequest);
                            transaction.setDialog(dialog, sipRequest
                                    .getDialogId(true));
                        }

                        return transaction;
                    } else {
                        // tx does not exist so create the tx.

                        MessageChannel mc = (MessageChannel) sipRequest
                        .getMessageChannel();
                        transaction = sipStack.createServerTransaction(mc);
                        if (transaction == null)
                            throw new TransactionUnavailableException(
                            "Transaction unavailable -- too many servrer transactions");

                        transaction.setOriginalRequest(sipRequest);
                        sipStack.mapTransaction(transaction);

                        // If there is a dialog already assigned then just
                        // assign the dialog to the transaction.
                        String dialogId = sipRequest.getDialogId(true);
                        SIPDialog dialog = sipStack.getDialog(dialogId);
                        if (dialog != null) {
                            dialog.addTransaction(transaction);
                            dialog.addRoute(sipRequest);
                            transaction.setDialog(dialog, sipRequest
                                    .getDialogId(true));
                        }

                        return transaction;
                    }
View Full Code Here

            throw new SipException("Stack is stopped");
        SIPResponse sipResponse = (SIPResponse) response;
        Via via = sipResponse.getTopmostVia();
        if (via == null)
            throw new SipException("No via header in response!");
        SIPServerTransaction st = (SIPServerTransaction) sipStack.findTransaction((SIPMessage)response, true);
        if ( st != null   && st.getInternalState() != TransactionState._TERMINATED && this.isAutomaticDialogSupportEnabled()) {
            throw new SipException("Transaction exists -- cannot send response statelessly");
        }
        String transport = via.getTransport();

        // check to see if Via has "received paramaeter". If so
View Full Code Here

        SIPDialog dialog = null;
        SIPTransaction sipTransaction = (SIPTransaction) transaction;

        if (transaction instanceof ServerTransaction) {
            SIPServerTransaction st = (SIPServerTransaction) transaction;
            Response response = st.getLastResponse();
            if (response != null) {
                if (response.getStatusCode() != 100)
                    throw new SipException(
                            "Cannot set dialog after response has been sent");
            }
View Full Code Here

            throws TransactionAlreadyExistsException,
            TransactionUnavailableException {

        if (!sipStack.isAlive())
            throw new TransactionUnavailableException("Stack is stopped");
        SIPServerTransaction transaction = null;
        SIPRequest sipRequest = (SIPRequest) request;
        try {
            sipRequest.checkHeaders();
        } catch (ParseException ex) {
            throw new TransactionUnavailableException(ex.getMessage(), ex);
        }

        if ( request.getMethod().equals(Request.ACK)) {
            if ( sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logError("Creating server transaction for ACK -- makes no sense!");
            throw new TransactionUnavailableException("Cannot create Server transaction for ACK ");
        }
        /*
         * Got a notify.
         */
        if (sipRequest.getMethod().equals(Request.NOTIFY)
                && sipRequest.getFromTag() != null
                && sipRequest.getToTag() == null) {

            SIPClientTransaction ct = sipStack.findSubscribeTransaction(
                    sipRequest, (ListeningPointImpl) this.getListeningPoint());
            /* Issue 104 */
            if (ct == null && ! sipStack.isDeliverUnsolicitedNotify()) {
                throw new TransactionUnavailableException(
                        "Cannot find matching Subscription (and gov.nist.javax.sip.DELIVER_UNSOLICITED_NOTIFY not set)");
            }
        }
        if ( !sipStack.acquireSem()) {
            throw new TransactionUnavailableException(
            "Transaction not available -- could not acquire stack lock");
        }
        try {
            if (sipStack.isDialogCreated(sipRequest.getMethod())) {
                if (sipStack.findTransaction((SIPRequest) request, true) != null)
                    throw new TransactionAlreadyExistsException(
                    "server transaction already exists!");

                transaction = (SIPServerTransaction) ((SIPRequest) request)
                .getTransaction();
                if (transaction == null)
                    throw new TransactionUnavailableException(
                    "Transaction not available");
                if (transaction.getOriginalRequest() == null)
                    transaction.setOriginalRequest(sipRequest);
                try {
                    sipStack.addTransaction(transaction);
                } catch (IOException ex) {
                    throw new TransactionUnavailableException(
                    "Error sending provisional response");
                }
                // So I can handle timeouts.
                transaction.addEventListener(this);
                if (isAutomaticDialogSupportEnabled()) {
                    // If automatic dialog support is enabled then
                    // this tx gets his own dialog.
                    String dialogId = sipRequest.getDialogId(true);
                    SIPDialog dialog = sipStack.getDialog(dialogId);
                    if (dialog == null) {
                        dialog = sipStack.createDialog(transaction);

                    }
                    transaction.setDialog(dialog, sipRequest.getDialogId(true));
                    if (sipRequest.getMethod().equals(Request.INVITE) && this.isDialogErrorsAutomaticallyHandled()) {
                        sipStack.putInMergeTable(transaction, sipRequest);
                    }
                    dialog.addRoute(sipRequest);
                    if (dialog.getRemoteTag() != null
                            && dialog.getLocalTag() != null) {
                        this.sipStack.putDialog(dialog);
                    }
                }

            } else {
                if (isAutomaticDialogSupportEnabled()) {
                    /*
                     * Under automatic dialog support, dialog is tied into a transaction. You cannot
                     * create a server tx except for dialog creating transactions. After that, all
                     * subsequent transactions are created for you by the stack.
                     */
                    transaction = (SIPServerTransaction) sipStack.findTransaction(
                            (SIPRequest) request, true);
                    if (transaction != null)
                        throw new TransactionAlreadyExistsException(
                        "Transaction exists! ");
                    transaction = (SIPServerTransaction) ((SIPRequest) request)
                    .getTransaction();
                    if (transaction == null)
                        throw new TransactionUnavailableException(
                        "Transaction not available!");
                    if (transaction.getOriginalRequest() == null)
                        transaction.setOriginalRequest(sipRequest);
                    // Map the transaction.
                    try {
                        sipStack.addTransaction(transaction);
                    } catch (IOException ex) {
                        throw new TransactionUnavailableException(
                        "Could not send back provisional response!");
                    }

                    // If there is a dialog already assigned then just update the
                    // dialog state.
                    String dialogId = sipRequest.getDialogId(true);
                    SIPDialog dialog = sipStack.getDialog(dialogId);
                    if (dialog != null) {
                        dialog.addTransaction(transaction);
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, sipRequest.getDialogId(true));
                    }

                } else {
                    transaction = (SIPServerTransaction) sipStack.findTransaction(
                            (SIPRequest) request, true);
                    if (transaction != null)
                        throw new TransactionAlreadyExistsException(
                        "Transaction exists! ");
                    transaction = (SIPServerTransaction) ((SIPRequest) request)
                    .getTransaction();
                    if (transaction != null) {
                        if (transaction.getOriginalRequest() == null)
                            transaction.setOriginalRequest(sipRequest);
                        // Map the transaction.
                        sipStack.mapTransaction(transaction);

                        // If there is a dialog already assigned then just
                        // assign the dialog to the transaction.
                        String dialogId = sipRequest.getDialogId(true);
                        SIPDialog dialog = sipStack.getDialog(dialogId);
                        if (dialog != null) {
                            dialog.addTransaction(transaction);
                            dialog.addRoute(sipRequest);
                            transaction.setDialog(dialog, sipRequest
                                    .getDialogId(true));
                        }

                        return transaction;
                    } else {
                        // tx does not exist so create the tx.

                        MessageChannel mc = (MessageChannel) sipRequest
                        .getMessageChannel();
                        transaction = sipStack.createServerTransaction(mc);
                        if (transaction == null)
                            throw new TransactionUnavailableException(
                            "Transaction unavailable -- too many servrer transactions");

                        transaction.setOriginalRequest(sipRequest);
                        sipStack.mapTransaction(transaction);

                        // If there is a dialog already assigned then just
                        // assign the dialog to the transaction.
                        String dialogId = sipRequest.getDialogId(true);
                        SIPDialog dialog = sipStack.getDialog(dialogId);
                        if (dialog != null) {
                            dialog.addTransaction(transaction);
                            dialog.addRoute(sipRequest);
                            transaction.setDialog(dialog, sipRequest
                                    .getDialogId(true));
                        }

                        return transaction;
                    }
View Full Code Here

            throw new SipException("Stack is stopped");
        SIPResponse sipResponse = (SIPResponse) response;
        Via via = sipResponse.getTopmostVia();
        if (via == null)
            throw new SipException("No via header in response!");
        SIPServerTransaction st = (SIPServerTransaction) sipStack.findTransaction((SIPMessage)response, true);
        if ( st != null   && st.getState() != TransactionState.TERMINATED && this.isAutomaticDialogSupportEnabled()) {
            throw new SipException("Transaction exists -- cannot send response statelessly");
        }
        String transport = via.getTransport();

        // check to see if Via has "received paramaeter". If so
View Full Code Here

        SIPDialog dialog = null;
        SIPTransaction sipTransaction = (SIPTransaction) transaction;

        if (transaction instanceof ServerTransaction) {
            SIPServerTransaction st = (SIPServerTransaction) transaction;
            Response response = st.getLastResponse();
            if (response != null) {
                if (response.getStatusCode() != 100)
                    throw new SipException(
                            "Cannot set dialog after response has been sent");
            }
View Full Code Here

        if (sipStack == null)
            InternalErrorHandler.handleException("Egads! no sip stack!");

        // Look for the registered SIPListener for the message channel.

        SIPServerTransaction transaction = (SIPServerTransaction) this.transactionChannel;
        if (transaction != null) {
            if (sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logDebug(
                        "transaction state = " + transaction.getState());
        }
        String dialogId = sipRequest.getDialogId(true);
        SIPDialog dialog = sipStack.getDialog(dialogId);
        /*
         * Check if we got this request on the contact address of the dialog If not the dialog
         * does not belong to this request. We check this condition if a contact address has been
         * assigned to the dialog. Forgive the sins of B2BUA's that like to record route ACK's
         */
        if (dialog != null && sipProvider != dialog.getSipProvider()) {
            Contact contact = dialog.getMyContactHeader();
            if (contact != null) {
                SipUri contactUri = (SipUri) (contact.getAddress().getURI());
                String ipAddress = contactUri.getHost();
                int contactPort = contactUri.getPort();
                String contactTransport = contactUri.getTransportParam();
                if (contactTransport == null)
                    contactTransport = "udp";
                if (contactPort == -1) {
                    if (contactTransport.equals("udp") || contactTransport.equals("tcp"))
                        contactPort = 5060;
                    else
                        contactPort = 5061;
                }
                // Check if the dialog contact is the same as the provider on
                // which we got the request. Otherwise, dont assign this
                // dialog to the request.
                if (ipAddress != null
                        && (!ipAddress.equals(listeningPoint.getIPAddress()) || contactPort != listeningPoint
                                .getPort())) {
                    if (sipStack.isLoggingEnabled()) {
                        sipStack.getStackLogger().logDebug(
                                "nulling dialog -- listening point mismatch!  " + contactPort
                                        + "  lp port = " + listeningPoint.getPort());

                    }
                    dialog = null;
                }

            }
        }

        /*
         * RFC 3261 8.2.2.2 Merged requests: If the request has no tag in the To header field, the
         * UAS core MUST check the request against ongoing transactions. If the From tag, Call-ID,
         * and CSeq exactly match those associated with an ongoing transaction, but the request
         * does not match that transaction (based on the matching rules in Section 17.2.3), the
         * UAS core SHOULD generate a 482 (Loop Detected) response and pass it to the server
         * transaction. This support is only enabled when the stack has been instructed to
         * function with Automatic Dialog Support.
         */
        if ( sipProvider.isDialogErrorsAutomaticallyHandled()
                && sipRequest.getToTag() == null) {
            if ( sipStack
                    .findMergedTransaction(sipRequest)) {
                this.sendLoopDetectedResponse(sipRequest, transaction);
                return;
            }
        }

        if (sipStack.isLoggingEnabled()) {
            sipStack.getStackLogger().logDebug("dialogId = " + dialogId);
            sipStack.getStackLogger().logDebug("dialog = " + dialog);
        }

        /*
         * RFC 3261 Section 16.4 If the first value in the Route header field indicates this
         * proxy,the proxy MUST remove that value from the request .
         */

        // If the message is being processed
        // by a Proxy, then the proxy will take care of stripping the
        // Route header. If the request is being processed by an
        // endpoint, then the stack strips off the route header.
        if (sipRequest.getHeader(Route.NAME) != null && transaction.getDialog() != null) {
            RouteList routes = sipRequest.getRouteHeaders();
            Route route = (Route) routes.getFirst();
            SipUri uri = (SipUri) route.getAddress().getURI();
            int port;
            if (uri.getHostPort().hasPort()) {
                port = uri.getHostPort().getPort();
            } else {
                if (listeningPoint.getTransport().equalsIgnoreCase("TLS"))
                    port = 5061;
                else
                    port = 5060;
            }
            String host = uri.getHost();
            if ((host.equals(listeningPoint.getIPAddress()) || host
                    .equalsIgnoreCase(listeningPoint.getSentBy()))
                    && port == listeningPoint.getPort()) {
                if (routes.size() == 1)
                    sipRequest.removeHeader(Route.NAME);
                else
                    routes.removeFirst();
            }
        }

        if (sipRequest.getMethod().equals(Request.REFER) && dialog != null
                && sipProvider.isDialogErrorsAutomaticallyHandled()) {
            /*
             * An agent responding to a REFER method MUST return a 400 (Bad Request) if the
             * request contained zero or more than one Refer-To header field values.
             */
            ReferToHeader sipHeader = (ReferToHeader) sipRequest.getHeader(ReferTo.NAME);
            if (sipHeader == null) {
                this
                        .sendBadRequestResponse(sipRequest, transaction,
                                "Refer-To header is missing");
                return;

            }

            /*
             * A refer cannot be processed until previous transaction has been completed.
             */
            SIPTransaction lastTransaction = ((SIPDialog) dialog).getLastTransaction();
            if (lastTransaction != null  && sipProvider.isDialogErrorsAutomaticallyHandled()) {
                SIPRequest lastRequest = (SIPRequest) lastTransaction.getRequest();
                if (lastTransaction instanceof SIPServerTransaction) {
                    if (lastTransaction.getState() == TransactionState.PROCEEDING
                            && lastRequest.getMethod().equals(Request.INVITE)) {
                        this.sendRequestPendingResponse(sipRequest, transaction);
                        return;
                    }
                } else if (lastTransaction != null && lastTransaction instanceof SIPClientTransaction) {
                    long cseqno = lastRequest.getCSeqHeader().getSeqNumber();
                    String method = lastRequest.getMethod();
                    if (method.equals(Request.INVITE) && lastTransaction.getState() != TransactionState.TERMINATED &&
                        lastTransaction.getState() != TransactionState.COMPLETED ) {
                        this.sendRequestPendingResponse(sipRequest, transaction);
                        return;
                    }
                }
            }

        } else if (sipRequest.getMethod().equals(Request.UPDATE)) {
            /*
             * Got an UPDATE method and the user dialog does not exist and the user wants to be a
             * User agent.
             *
             */
            if (sipProvider.isAutomaticDialogSupportEnabled() && dialog == null) {
                this.sendCallOrTransactionDoesNotExistResponse(sipRequest, transaction);
                return;
            }
        } else if (sipRequest.getMethod().equals(Request.ACK)) {

            if (transaction != null && transaction.isInviteTransaction()) {
                // This is an ack for a 3xx-6xx response. Just let the tx laer
                // take care of it.
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Processing ACK for INVITE Tx ");
              

            } else {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Processing ACK for dialog " + dialog);

                if (dialog == null) {
                    if (sipStack.isLoggingEnabled()) {
                        sipStack.getStackLogger().logDebug(
                                "Dialog does not exist " + sipRequest.getFirstLine()
                                        + " isServerTransaction = " + true);

                    }
                    SIPServerTransaction st = sipStack
                            .getRetransmissionAlertTransaction(dialogId);
                    if (st != null && st.isRetransmissionAlertEnabled()) {
                        st.disableRetransmissionAlerts();

                    }
                    /*
                     * JvB: must never drop ACKs that dont match a transaction! One cannot be sure
                     * if it isn't an ACK for a 2xx response
                     *
                     */
                    SIPServerTransaction ackTransaction = sipStack
                            .findTransactionPendingAck(sipRequest);
                    /*
                     * Found a transaction ( that we generated ) which is waiting for ACK. So ACK
                     * it and return.
                     */
                    if (ackTransaction != null) {
                        if (sipStack.isLoggingEnabled())
                            sipStack.getStackLogger().logDebug("Found Tx pending ACK");
                        try {
                            ackTransaction.setAckSeen();
                            sipStack.removeTransaction(ackTransaction);
                            sipStack.removeTransactionPendingAck(ackTransaction);
                        } catch (Exception ex) {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logError(
                                        "Problem terminating transaction", ex);
                            }
                        }
                        return;
                    }

                } else {
                    if (!dialog.handleAck(transaction)) {
                        if (!dialog.isSequnceNumberValidation()) {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logDebug(
                                        "Dialog exists with loose dialog validation "
                                                + sipRequest.getFirstLine()
                                                + " isServerTransaction = " + true + " dialog = "
                                                + dialog.getDialogId());

                            }
                            SIPServerTransaction st = sipStack
                                    .getRetransmissionAlertTransaction(dialogId);
                            if (st != null && st.isRetransmissionAlertEnabled()) {
                                st.disableRetransmissionAlerts();

                            }
                        } else {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logDebug(
                                        "Dropping ACK - cannot find a transaction or dialog");
                            }
                            SIPServerTransaction ackTransaction = sipStack
                                    .findTransactionPendingAck(sipRequest);
                            if (ackTransaction != null) {
                                if (sipStack.isLoggingEnabled())
                                    sipStack.getStackLogger().logDebug("Found Tx pending ACK");
                                try {
                                    ackTransaction.setAckSeen();
                                    sipStack.removeTransaction(ackTransaction);
                                    sipStack.removeTransactionPendingAck(ackTransaction);
                                } catch (Exception ex) {
                                    if (sipStack.isLoggingEnabled()) {
                                        sipStack.getStackLogger().logError(
                                                "Problem terminating transaction", ex);
                                    }
                                }
                            }
                            /*
                             * For test only we support a flag that will deliver retransmitted
                             * ACK for 200 OK responses to the listener.
                             */
                            if ( (! sipStack.isDeliverRetransmittedAckToListener() ) ||  ( ackTransaction != null &&
                                !sipStack.isNon2XXAckPassedToListener() ) ) {
                              return;
                            }
                        }
                    } else {
                      
                        dialog.addTransaction(transaction);
                        transaction.passToListener();
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, dialogId);
                        if (sipRequest.getMethod().equals(Request.INVITE)
                                && sipProvider.isDialogErrorsAutomaticallyHandled()) {
                            sipStack.putInMergeTable(transaction, sipRequest);
                        }
                        /*
                         * Note that ACK is a pseudo transaction. It is never added to the stack
                         * and you do not get transaction terminated events on ACK.
                         */

                        if (sipStack.isDeliverTerminatedEventForAck()) {
                            try {
                                sipStack.addTransaction(transaction);
                                transaction.scheduleAckRemoval();
                            } catch (IOException ex) {

                            }
                        } else {
                            transaction.setMapped(true);
                        }

                    }
                }
            }
        } else if (sipRequest.getMethod().equals(Request.PRACK)) {

            /*
             * RFC 3262: A matching PRACK is defined as one within the same dialog as the
             * response, and whose method, CSeq-num, and response-num in the RAck header field
             * match, respectively, the method from the CSeq, the sequence number from the CSeq,
             * and the sequence number from the RSeq of the reliable provisional response.
             */

            if (sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logDebug("Processing PRACK for dialog " + dialog);

            if (dialog == null && sipProvider.isAutomaticDialogSupportEnabled()) {
                if (sipStack.isLoggingEnabled()) {
                    sipStack.getStackLogger().logDebug(
                            "Dialog does not exist " + sipRequest.getFirstLine()
                                    + " isServerTransaction = " + true);

                }
                if (sipStack.isLoggingEnabled()) {
                    sipStack
                            .getStackLogger()
                            .logDebug(
                                    "Sending 481 for PRACK - automatic dialog support is enabled -- cant find dialog!");
                }
                SIPResponse notExist = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);

                try {
                    sipProvider.sendResponse(notExist);
                } catch (SipException e) {
                    sipStack.getStackLogger().logError("error sending response", e);
                }
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                }
                return;

            } else if (dialog != null) {
                if (!dialog.handlePrack(sipRequest)) {
                    if (sipStack.isLoggingEnabled())
                        sipStack.getStackLogger().logDebug("Dropping out of sequence PRACK ");
                    if (transaction != null) {
                        sipStack.removeTransaction(transaction);
                        transaction.releaseSem();
                    }
                    return;
                } else {
                    try {
                        sipStack.addTransaction(transaction);
                        dialog.addTransaction(transaction);
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, dialogId);
                    } catch (Exception ex) {
                        InternalErrorHandler.handleException(ex);
                    }
                }
            } else {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "Processing PRACK without a DIALOG -- this must be a proxy element");
            }

        } else if (sipRequest.getMethod().equals(Request.BYE)) {
            // Check for correct sequence numbering of the BYE
            if (dialog != null && !dialog.isRequestConsumable(sipRequest)) {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "Dropping out of sequence BYE " + dialog.getRemoteSeqNumber() + " "
                                    + sipRequest.getCSeq().getSeqNumber());

                if (dialog.getRemoteSeqNumber() >= sipRequest.getCSeq().getSeqNumber()
                        && transaction.getState() == TransactionState.TRYING) {

                    this.sendServerInternalErrorResponse(sipRequest, transaction);

                }
                // If the stack knows about the tx, then remove it.
                if (transaction != null)
                    sipStack.removeTransaction(transaction);
                return;

            } else if (dialog == null && sipProvider.isAutomaticDialogSupportEnabled()) {
                // Drop bye's with 481 if dialog does not exist.
                // If dialog support is enabled then
                // there must be a dialog associated with the bye
                // No dialog could be found and requests on this
                // provider. Must act like a user agent -- so drop the request.
                // NOTE: if Automatic dialog support is not enabled,
                // then it is the application's responsibility to
                // take care of this error condition possibly.

                SIPResponse response = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);
                response.setReasonPhrase("Dialog Not Found");

                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "dropping request -- automatic dialog "
                                    + "support enabled and dialog does not exist!");
                try {
                    transaction.sendResponse(response);
                } catch (SipException ex) {
                    sipStack.getStackLogger().logError("Error in sending response", ex);
                }
                // If the stack knows about the tx, then remove it.
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                    transaction = null;
                }
                return;

            }

            // note that the transaction may be null (which
            // happens when no dialog for the bye was found.
            // and automatic dialog support is disabled (i.e. the app wants
            // to manage its own dialog layer.
            if (transaction != null && dialog != null) {
                try {
                    if (sipProvider == dialog.getSipProvider()) {
                        sipStack.addTransaction(transaction);
                        dialog.addTransaction(transaction);
                        transaction.setDialog(dialog, dialogId);
                    }

                } catch (IOException ex) {
                    InternalErrorHandler.handleException(ex);
                }
            }
            if (sipStack.isLoggingEnabled()) {
                sipStack.getStackLogger().logDebug(
                        "BYE Tx = " + transaction + " isMapped ="
                                + transaction.isTransactionMapped());
            }

        } else if (sipRequest.getMethod().equals(Request.CANCEL)) {

            SIPServerTransaction st = (SIPServerTransaction) sipStack.findCancelTransaction(
                    sipRequest, true);
            if (sipStack.isLoggingEnabled()) {
                sipStack.getStackLogger().logDebug(
                        "Got a CANCEL, InviteServerTx = " + st + " cancel Server Tx ID = "
                                + transaction + " isMapped = "
                                + transaction.isTransactionMapped());

            }
            // Processing incoming CANCEL.
            // Check if we can process the CANCEL request.
            if (sipRequest.getMethod().equals(Request.CANCEL)) {
                // If the CANCEL comes in too late, there's not
                // much that the Listener can do so just do the
                // default action and avoid bothering the listener.
                if (st != null && st.getState() == SIPTransaction.TERMINATED_STATE) {
                    // If transaction already exists but it is
                    // too late to cancel the transaction then
                    // just respond OK to the CANCEL and bail.
                    if (sipStack.isLoggingEnabled())
                        sipStack.getStackLogger().logDebug("Too late to cancel Transaction");
                    // send OK and just ignore the CANCEL.
                    try {

                        transaction.sendResponse(sipRequest.createResponse(Response.OK));
                    } catch (Exception ex) {
                        if (ex.getCause() != null && ex.getCause() instanceof IOException) {
                            st.raiseIOExceptionEvent();
                        }
                    }
                    return;
                }
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Cancel transaction = " + st);

            }
            if (transaction != null && st != null && st.getDialog() != null) {
                // Found an invite tx corresponding to the CANCEL.
                // Set up the client tx and pass up to listener.
                transaction.setDialog((SIPDialog) st.getDialog(), dialogId);
                dialog = (SIPDialog) st.getDialog();
            } else if (st == null && sipProvider.isAutomaticDialogSupportEnabled()
                    && transaction != null) {
                // Could not find a invite tx corresponding to the CANCEL.
                // Automatic dialog support is enabled so I must behave like
                // an endpoint on this provider.
                // Send the error response for the cancel.

                SIPResponse response = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);
                if (sipStack.isLoggingEnabled()) {
                    sipStack.getStackLogger().logDebug(
                            "dropping request -- automatic dialog support "
                                    + "enabled and INVITE ST does not exist!");
                }
                try {
                    sipProvider.sendResponse(response);
                } catch (SipException ex) {
                    InternalErrorHandler.handleException(ex);
                }
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                }
                return;

            }

            // INVITE was handled statefully so the CANCEL must also be
            // statefully handled.
            if (st != null) {
                try {
                    if (transaction != null) {
                        sipStack.addTransaction(transaction);
                        transaction.setPassToListener();
                        transaction.setInviteTransaction(st);
                        // Dont let the INVITE and CANCEL be concurrently
                        // processed.
                        st.acquireSem();

                    }

                } catch (Exception ex) {
                    InternalErrorHandler.handleException(ex);
View Full Code Here

        if (sipStack == null)
            InternalErrorHandler.handleException("Egads! no sip stack!");

        // Look for the registered SIPListener for the message channel.

        SIPServerTransaction transaction = (SIPServerTransaction) this.transactionChannel;
        if (transaction != null) {
            if (sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logDebug(
                        "transaction state = " + transaction.getState());
        }
        String dialogId = sipRequest.getDialogId(true);
        SIPDialog dialog = sipStack.getDialog(dialogId);
        /*
         * Check if we got this request on the contact address of the dialog If not the dialog
         * does not belong to this request. We check this condition if a contact address has been
         * assigned to the dialog. Forgive the sins of B2BUA's that like to record route ACK's
         */
        if (dialog != null && sipProvider != dialog.getSipProvider()) {
            Contact contact = dialog.getMyContactHeader();
            if (contact != null) {
                SipUri contactUri = (SipUri) (contact.getAddress().getURI());
                String ipAddress = contactUri.getHost();
                int contactPort = contactUri.getPort();
                String contactTransport = contactUri.getTransportParam();
                if (contactTransport == null)
                    contactTransport = "udp";
                if (contactPort == -1) {
                    if (contactTransport.equals("udp") || contactTransport.equals("tcp"))
                        contactPort = 5060;
                    else
                        contactPort = 5061;
                }
                // Check if the dialog contact is the same as the provider on
                // which we got the request. Otherwise, dont assign this
                // dialog to the request.
                if (ipAddress != null
                        && (!ipAddress.equals(listeningPoint.getIPAddress()) || contactPort != listeningPoint
                                .getPort())) {
                    if (sipStack.isLoggingEnabled()) {
                        sipStack.getStackLogger().logDebug(
                                "nulling dialog -- listening point mismatch!  " + contactPort
                                        + "  lp port = " + listeningPoint.getPort());

                    }
                    dialog = null;
                }

            }
        }

        /*
         * RFC 3261 8.2.2.2 Merged requests: If the request has no tag in the To header field, the
         * UAS core MUST check the request against ongoing transactions. If the From tag, Call-ID,
         * and CSeq exactly match those associated with an ongoing transaction, but the request
         * does not match that transaction (based on the matching rules in Section 17.2.3), the
         * UAS core SHOULD generate a 482 (Loop Detected) response and pass it to the server
         * transaction. This support is only enabled when the stack has been instructed to
         * function with Automatic Dialog Support.
         */
        if ( sipProvider.isDialogErrorsAutomaticallyHandled()
                && sipRequest.getToTag() == null) {
            if ( sipStack
                    .findMergedTransaction(sipRequest)) {
                this.sendLoopDetectedResponse(sipRequest, transaction);
                return;
            }
        }

        if (sipStack.isLoggingEnabled()) {
            sipStack.getStackLogger().logDebug("dialogId = " + dialogId);
            sipStack.getStackLogger().logDebug("dialog = " + dialog);
        }

        /*
         * RFC 3261 Section 16.4 If the first value in the Route header field indicates this
         * proxy,the proxy MUST remove that value from the request .
         */

        // If the message is being processed
        // by a Proxy, then the proxy will take care of stripping the
        // Route header. If the request is being processed by an
        // endpoint, then the stack strips off the route header.
        if (sipRequest.getHeader(Route.NAME) != null && transaction.getDialog() != null) {
            RouteList routes = sipRequest.getRouteHeaders();
            Route route = (Route) routes.getFirst();
            SipUri uri = (SipUri) route.getAddress().getURI();
            int port;
            if (uri.getHostPort().hasPort()) {
                port = uri.getHostPort().getPort();
            } else {
                if (listeningPoint.getTransport().equalsIgnoreCase("TLS"))
                    port = 5061;
                else
                    port = 5060;
            }
            String host = uri.getHost();
            if ((host.equals(listeningPoint.getIPAddress()) || host
                    .equalsIgnoreCase(listeningPoint.getSentBy()))
                    && port == listeningPoint.getPort()) {
                if (routes.size() == 1)
                    sipRequest.removeHeader(Route.NAME);
                else
                    routes.removeFirst();
            }
        }

        if (sipRequest.getMethod().equals(Request.REFER) && dialog != null
                && sipProvider.isDialogErrorsAutomaticallyHandled()) {
            /*
             * An agent responding to a REFER method MUST return a 400 (Bad Request) if the
             * request contained zero or more than one Refer-To header field values.
             */
            ReferToHeader sipHeader = (ReferToHeader) sipRequest.getHeader(ReferTo.NAME);
            if (sipHeader == null) {
                this
                        .sendBadRequestResponse(sipRequest, transaction,
                                "Refer-To header is missing");
                return;

            }

            /*
             * A refer cannot be processed until previous transaction has been completed.
             */
            SIPTransaction lastTransaction = ((SIPDialog) dialog).getLastTransaction();
            if (lastTransaction != null  && sipProvider.isDialogErrorsAutomaticallyHandled()) {
                SIPRequest lastRequest = (SIPRequest) lastTransaction.getRequest();
                if (lastTransaction instanceof SIPServerTransaction) {
                    if (lastTransaction.getState() == TransactionState.PROCEEDING
                            && lastRequest.getMethod().equals(Request.INVITE)) {
                        this.sendRequestPendingResponse(sipRequest, transaction);
                        return;
                    }
                } else if (lastTransaction != null && lastTransaction instanceof SIPClientTransaction) {
                    long cseqno = lastRequest.getCSeqHeader().getSeqNumber();
                    String method = lastRequest.getMethod();
                    if (method.equals(Request.INVITE) && lastTransaction.getState() != TransactionState.TERMINATED &&
                        lastTransaction.getState() != TransactionState.COMPLETED ) {
                        this.sendRequestPendingResponse(sipRequest, transaction);
                        return;
                    }
                }
            }

        } else if (sipRequest.getMethod().equals(Request.UPDATE)) {
            /*
             * Got an UPDATE method and the user dialog does not exist and the user wants to be a
             * User agent.
             *
             */
            if (sipProvider.isAutomaticDialogSupportEnabled() && dialog == null) {
                this.sendCallOrTransactionDoesNotExistResponse(sipRequest, transaction);
                return;
            }
        } else if (sipRequest.getMethod().equals(Request.ACK)) {

            if (transaction != null && transaction.isInviteTransaction()) {
                // This is an ack for a 3xx-6xx response. Just let the tx laer
                // take care of it.
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Processing ACK for INVITE Tx ");
              

            } else {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Processing ACK for dialog " + dialog);

                if (dialog == null) {
                    if (sipStack.isLoggingEnabled()) {
                        sipStack.getStackLogger().logDebug(
                                "Dialog does not exist " + sipRequest.getFirstLine()
                                        + " isServerTransaction = " + true);

                    }
                    SIPServerTransaction st = sipStack
                            .getRetransmissionAlertTransaction(dialogId);
                    if (st != null && st.isRetransmissionAlertEnabled()) {
                        st.disableRetransmissionAlerts();

                    }
                    /*
                     * JvB: must never drop ACKs that dont match a transaction! One cannot be sure
                     * if it isn't an ACK for a 2xx response
                     *
                     */
                    SIPServerTransaction ackTransaction = sipStack
                            .findTransactionPendingAck(sipRequest);
                    /*
                     * Found a transaction ( that we generated ) which is waiting for ACK. So ACK
                     * it and return.
                     */
                    if (ackTransaction != null) {
                        if (sipStack.isLoggingEnabled())
                            sipStack.getStackLogger().logDebug("Found Tx pending ACK");
                        try {
                            ackTransaction.setAckSeen();
                            sipStack.removeTransaction(ackTransaction);
                            sipStack.removeTransactionPendingAck(ackTransaction);
                        } catch (Exception ex) {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logError(
                                        "Problem terminating transaction", ex);
                            }
                        }
                        return;
                    }

                } else {
                    if (!dialog.handleAck(transaction)) {
                        if (!dialog.isSequnceNumberValidation()) {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logDebug(
                                        "Dialog exists with loose dialog validation "
                                                + sipRequest.getFirstLine()
                                                + " isServerTransaction = " + true + " dialog = "
                                                + dialog.getDialogId());

                            }
                            SIPServerTransaction st = sipStack
                                    .getRetransmissionAlertTransaction(dialogId);
                            if (st != null && st.isRetransmissionAlertEnabled()) {
                                st.disableRetransmissionAlerts();

                            }
                        } else {
                            if (sipStack.isLoggingEnabled()) {
                                sipStack.getStackLogger().logDebug(
                                        "Dropping ACK - cannot find a transaction or dialog");
                            }
                            SIPServerTransaction ackTransaction = sipStack
                                    .findTransactionPendingAck(sipRequest);
                            if (ackTransaction != null) {
                                if (sipStack.isLoggingEnabled())
                                    sipStack.getStackLogger().logDebug("Found Tx pending ACK");
                                try {
                                    ackTransaction.setAckSeen();
                                    sipStack.removeTransaction(ackTransaction);
                                    sipStack.removeTransactionPendingAck(ackTransaction);
                                } catch (Exception ex) {
                                    if (sipStack.isLoggingEnabled()) {
                                        sipStack.getStackLogger().logError(
                                                "Problem terminating transaction", ex);
                                    }
                                }
                            }
                            /*
                             * For test only we support a flag that will deliver retransmitted
                             * ACK for 200 OK responses to the listener.
                             */
                            if ( (! sipStack.isDeliverRetransmittedAckToListener() ) ||  ( ackTransaction != null &&
                                !sipStack.isNon2XXAckPassedToListener() ) ) {
                              return;
                            }
                        }
                    } else {
                      
                        dialog.addTransaction(transaction);
                        transaction.passToListener();
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, dialogId);
                        if (sipRequest.getMethod().equals(Request.INVITE)
                                && sipProvider.isDialogErrorsAutomaticallyHandled()) {
                            sipStack.putInMergeTable(transaction, sipRequest);
                        }
                        /*
                         * Note that ACK is a pseudo transaction. It is never added to the stack
                         * and you do not get transaction terminated events on ACK.
                         */

                        if (sipStack.isDeliverTerminatedEventForAck()) {
                            try {
                                sipStack.addTransaction(transaction);
                                transaction.scheduleAckRemoval();
                            } catch (IOException ex) {

                            }
                        } else {
                            transaction.setMapped(true);
                        }

                    }
                }
            }
        } else if (sipRequest.getMethod().equals(Request.PRACK)) {

            /*
             * RFC 3262: A matching PRACK is defined as one within the same dialog as the
             * response, and whose method, CSeq-num, and response-num in the RAck header field
             * match, respectively, the method from the CSeq, the sequence number from the CSeq,
             * and the sequence number from the RSeq of the reliable provisional response.
             */

            if (sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logDebug("Processing PRACK for dialog " + dialog);

            if (dialog == null && sipProvider.isAutomaticDialogSupportEnabled()) {
                if (sipStack.isLoggingEnabled()) {
                    sipStack.getStackLogger().logDebug(
                            "Dialog does not exist " + sipRequest.getFirstLine()
                                    + " isServerTransaction = " + true);

                }
                if (sipStack.isLoggingEnabled()) {
                    sipStack
                            .getStackLogger()
                            .logDebug(
                                    "Sending 481 for PRACK - automatic dialog support is enabled -- cant find dialog!");
                }
                SIPResponse notExist = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);

                try {
                    sipProvider.sendResponse(notExist);
                } catch (SipException e) {
                    sipStack.getStackLogger().logError("error sending response", e);
                }
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                }
                return;

            } else if (dialog != null) {
                if (!dialog.handlePrack(sipRequest)) {
                    if (sipStack.isLoggingEnabled())
                        sipStack.getStackLogger().logDebug("Dropping out of sequence PRACK ");
                    if (transaction != null) {
                        sipStack.removeTransaction(transaction);
                        transaction.releaseSem();
                    }
                    return;
                } else {
                    try {
                        sipStack.addTransaction(transaction);
                        dialog.addTransaction(transaction);
                        dialog.addRoute(sipRequest);
                        transaction.setDialog(dialog, dialogId);
                    } catch (Exception ex) {
                        InternalErrorHandler.handleException(ex);
                    }
                }
            } else {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "Processing PRACK without a DIALOG -- this must be a proxy element");
            }

        } else if (sipRequest.getMethod().equals(Request.BYE)) {
            // Check for correct sequence numbering of the BYE
            if (dialog != null && !dialog.isRequestConsumable(sipRequest)) {
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "Dropping out of sequence BYE " + dialog.getRemoteSeqNumber() + " "
                                    + sipRequest.getCSeq().getSeqNumber());

                if (dialog.getRemoteSeqNumber() >= sipRequest.getCSeq().getSeqNumber()
                        && transaction.getState() == TransactionState.TRYING) {

                    this.sendServerInternalErrorResponse(sipRequest, transaction);

                }
                // If the stack knows about the tx, then remove it.
                if (transaction != null)
                    sipStack.removeTransaction(transaction);
                return;

            } else if (dialog == null && sipProvider.isAutomaticDialogSupportEnabled()) {
                // Drop bye's with 481 if dialog does not exist.
                // If dialog support is enabled then
                // there must be a dialog associated with the bye
                // No dialog could be found and requests on this
                // provider. Must act like a user agent -- so drop the request.
                // NOTE: if Automatic dialog support is not enabled,
                // then it is the application's responsibility to
                // take care of this error condition possibly.

                SIPResponse response = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);
                response.setReasonPhrase("Dialog Not Found");

                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug(
                            "dropping request -- automatic dialog "
                                    + "support enabled and dialog does not exist!");
                try {
                    transaction.sendResponse(response);
                } catch (SipException ex) {
                    sipStack.getStackLogger().logError("Error in sending response", ex);
                }
                // If the stack knows about the tx, then remove it.
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                    transaction = null;
                }
                return;

            }

            // note that the transaction may be null (which
            // happens when no dialog for the bye was found.
            // and automatic dialog support is disabled (i.e. the app wants
            // to manage its own dialog layer.
            if (transaction != null && dialog != null) {
                try {
                    if (sipProvider == dialog.getSipProvider()) {
                        sipStack.addTransaction(transaction);
                        dialog.addTransaction(transaction);
                        transaction.setDialog(dialog, dialogId);
                    }

                } catch (IOException ex) {
                    InternalErrorHandler.handleException(ex);
                }
            }
            if (sipStack.isLoggingEnabled()) {
                sipStack.getStackLogger().logDebug(
                        "BYE Tx = " + transaction + " isMapped ="
                                + transaction.isTransactionMapped());
            }

        } else if (sipRequest.getMethod().equals(Request.CANCEL)) {

            SIPServerTransaction st = (SIPServerTransaction) sipStack.findCancelTransaction(
                    sipRequest, true);
            if (sipStack.isLoggingEnabled()) {
                sipStack.getStackLogger().logDebug(
                        "Got a CANCEL, InviteServerTx = " + st + " cancel Server Tx ID = "
                                + transaction + " isMapped = "
                                + transaction.isTransactionMapped());

            }
            // Processing incoming CANCEL.
            // Check if we can process the CANCEL request.
            if (sipRequest.getMethod().equals(Request.CANCEL)) {
                // If the CANCEL comes in too late, there's not
                // much that the Listener can do so just do the
                // default action and avoid bothering the listener.
                if (st != null && st.getState() == SIPTransaction.TERMINATED_STATE) {
                    // If transaction already exists but it is
                    // too late to cancel the transaction then
                    // just respond OK to the CANCEL and bail.
                    if (sipStack.isLoggingEnabled())
                        sipStack.getStackLogger().logDebug("Too late to cancel Transaction");
                    // send OK and just ignore the CANCEL.
                    try {

                        transaction.sendResponse(sipRequest.createResponse(Response.OK));
                    } catch (Exception ex) {
                        if (ex.getCause() != null && ex.getCause() instanceof IOException) {
                            st.raiseIOExceptionEvent();
                        }
                    }
                    return;
                }
                if (sipStack.isLoggingEnabled())
                    sipStack.getStackLogger().logDebug("Cancel transaction = " + st);

            }
            if (transaction != null && st != null && st.getDialog() != null) {
                // Found an invite tx corresponding to the CANCEL.
                // Set up the client tx and pass up to listener.
                transaction.setDialog((SIPDialog) st.getDialog(), dialogId);
                dialog = (SIPDialog) st.getDialog();
            } else if (st == null && sipProvider.isAutomaticDialogSupportEnabled()
                    && transaction != null) {
                // Could not find a invite tx corresponding to the CANCEL.
                // Automatic dialog support is enabled so I must behave like
                // an endpoint on this provider.
                // Send the error response for the cancel.

                SIPResponse response = sipRequest
                        .createResponse(Response.CALL_OR_TRANSACTION_DOES_NOT_EXIST);
                if (sipStack.isLoggingEnabled()) {
                    sipStack.getStackLogger().logDebug(
                            "dropping request -- automatic dialog support "
                                    + "enabled and INVITE ST does not exist!");
                }
                try {
                    sipProvider.sendResponse(response);
                } catch (SipException ex) {
                    InternalErrorHandler.handleException(ex);
                }
                if (transaction != null) {
                    sipStack.removeTransaction(transaction);
                    transaction.releaseSem();
                }
                return;

            }

            // INVITE was handled statefully so the CANCEL must also be
            // statefully handled.
            if (st != null) {
                try {
                    if (transaction != null) {
                        sipStack.addTransaction(transaction);
                        transaction.setPassToListener();
                        transaction.setInviteTransaction(st);
                        // Dont let the INVITE and CANCEL be concurrently
                        // processed.
                        st.acquireSem();

                    }

                } catch (Exception ex) {
                    InternalErrorHandler.handleException(ex);
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