Examples of javax.sip.header.CSeqHeader

javax.sip.header.CSeqHeader
A CSeq header field in a request contains a single decimal sequence number and the request method. The CSeq header field serves to identify and order transactions within a dialog, to provide a means to uniquely identify transactions, and to differentiate between new requests and request retransmissions. Two CSeq header fields are considered equal if the sequence number and the request method are identical.
- Method - The method part of CSeq is case-sensitive and MUST match that of the request.
- Sequence number - The sequence number is chosen by the requesting client and is unique within a single value of Call-ID. The sequence number MUST be expressible as a 32-bit unsigned integer and MUST be less than 2**31. For non-REGISTER requests outside of a dialog, the sequence number value is arbitrary. Consecutive Requests that differ in method, headers or body, but have the same CallIdHeader must contain strictly monotonically increasing and contiguous sequence numbers; sequence numbers do not wrap around. Retransmissions of the same Request carry the same sequence number, but an INVITE Request with a different message body or different headers (a "re-invitation") acquires a new, higher sequence number. A server must echo the CSeqHeader from the Request in its Response. If the method value is missing in the received CSeqHeader, the server fills it in appropriately. ACK and CANCEL Requests must contain the same CSeqHeader sequence number (but not method) as the INVITE Request they refer to, while a BYE Request cancelling an invitation must have a higher sequence number. An user agent server must remember the highest sequence number for any INVITE Request with the same CallIdHeader. The server must respond to, and then discard, any INVITE Request with a lower sequence number.
As long as a client follows the above guidelines, it may use any mechanism it would like to select CSeq header field values.
Forked Requests:
Forked Requests must have the same CSeqHeader as there would be ambiguity otherwise between these forked Requests and later BYE Requests issued by the client user agent.
For Example:
CSeq: 4711 INVITE @author BEA Systems, NIST @version 1.2

                // JvB: Make sure that the implementation matches the messagefactory
                callIdHeader = protocolObjects.headerFactory.createCallIdHeader(callIdHeader
                        .getCallId());


                // Create a new Cseq header
                CSeqHeader cSeqHeader = protocolObjects.headerFactory.createCSeqHeader(1L,
                        Request.INVITE);


                // Create a new MaxForwardsHeader
                MaxForwardsHeader maxForwards = protocolObjects.headerFactory
                        .createMaxForwardsHeader(70);

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                    + ((CSeqHeader) response.getHeader(CSeqHeader.NAME))
                            .getMethod());


            ClientTransaction tid = responseReceivedEvent
                    .getClientTransaction();
            CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);


            logger.info("Response received : Status Code = "
                    + response.getStatusCode() + " " + cseq);
            if (tid == null) {
                logger.info("Stray response -- dropping ");

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                    .getTransport();


            ContactHeader contactHeader = null;
            ToHeader toHeader = null;
            FromHeader fromHeader = null;
            CSeqHeader cseqHeader = null;
            ViaHeader viaHeader = null;
            CallIdHeader callIdHeader = null;
            MaxForwardsHeader maxForwardsHeader = null;
            ContentTypeHeader contentTypeHeader = null;
            RouteHeader routeHeader = null;

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            } else if (request.getMethod().equals(Request.ACK)) {
                Dialog dialog = requestEvent.getDialog();
                Dialog peer = this.getPeer(dialog);
                Response response = this.lastResponseTable.get(peer);
                CSeqHeader cseqHeader = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                String method = cseqHeader.getMethod();
                long seqno = cseqHeader.getSeqNumber();
                Request ack = peer.createAck(seqno);
                peer.sendAck(ack);
            }
           
        } catch ( Exception ex) {

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    public synchronized void processResponse(ResponseEvent responseReceivedEvent) {
        logger.info("Got a response");
        Response response = (Response) responseReceivedEvent.getResponse();
        ClientTransaction tid = responseReceivedEvent.getClientTransaction();
        CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);


        logger.info("Response received : Status Code = "
                + response.getStatusCode() + " " + cseq);
        logger.info("Response = " + response + " class=" + response.getClass() );


        Dialog dialog = responseReceivedEvent.getDialog();
        TestCase.assertNotNull( dialog );


        if (tid != null)
            logger.info("transaction state is " + tid.getState());
        else
            logger.info("transaction = " + tid);


        logger.info("Dialog = " + dialog);


        logger.info("Dialog state is " + dialog.getState());


        try {
            if (response.getStatusCode() == Response.OK) {
                if (cseq.getMethod().equals(Request.INVITE)) {
                    this.inviteOkSeen = true;
                    TestCase.assertEquals( DialogState.CONFIRMED, dialog.getState() );
                    Request ackRequest = dialog.createAck(cseq
                            .getSeqNumber());


                    TestCase.assertNotNull( ackRequest.getHeader( MaxForwardsHeader.NAME ) );


                    if ( dialog == this.ackedDialog ) {
                        dialog.sendAck(ackRequest);
                        return;
                    }
                    // Proxy will fork. I will accept the first dialog.
                    this.forkedDialogs.add(dialog);
                    if ( responseReceivedEvent.getClientTransaction() != null ) {
                        logger.info("Sending ACK");
                        dialog.sendAck(ackRequest);
                        TestCase.assertTrue(
                                "Dialog state should be CONFIRMED", dialog
                                        .getState() == DialogState.CONFIRMED);


                        TestCase.assertTrue(this.ackedDialog == null ||
                                this.ackedDialog == dialog);
                        this.ackedDialog = dialog;


                        if ( callerSendsBye ) {
                            timer.schedule( new SendBye(ackedDialog), 1000  );
                        }




                    } else {
                        this.canceledDialog.add(dialog);
                        // Send ACK to quench re-transmission
                        sipProvider.sendRequest(ackRequest);
                        // Kill the second dialog by sending a bye.
                        SipProvider sipProvider = (SipProvider) responseReceivedEvent
                                .getSource();


                        Request byeRequest = dialog.createRequest(Request.BYE);
                        ClientTransaction ct = sipProvider
                                .getNewClientTransaction(byeRequest);
                        dialog.sendRequest(ct);
                    }




                } else if ( cseq.getMethod().equals(Request.BYE)) {


                    if ( dialog == this.ackedDialog) {
                        this.byeResponseSeen = true;
                    }
                } else {
                    logger.info("Response method = " + cseq.getMethod());
                }
            } else if ( response.getStatusCode() == Response.RINGING ) {
                //TestHarness.assertEquals( DialogState.EARLY, dialog.getState() );
            }
        } catch (Throwable ex) {

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            // JvB: Make sure that the implementation matches the messagefactory
            callIdHeader = headerFactory
                    .createCallIdHeader(callIdHeader.getCallId());


            // Create a new Cseq header
            CSeqHeader cSeqHeader = headerFactory
                    .createCSeqHeader(1L, Request.INVITE);


            // Create a new MaxForwardsHeader
            MaxForwardsHeader maxForwards = headerFactory
                    .createMaxForwardsHeader(70);

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                    System.out.println("shootme: got an OK response! ");
                    System.out.println("Dialog State = " + dialog.getState());
                    SipProvider provider = (SipProvider) responseEvent.getSource();


                    Request messageRequest = dialog.createRequest(Request.MESSAGE);
                    CSeqHeader cseq = (CSeqHeader)messageRequest.getHeader(CSeqHeader.NAME);


                    // We will test if the CSEq validation is off by sending CSeq 1 again
                    cseq.setSeqNumber(1);
                    ClientTransaction ct = provider
                    .getNewClientTransaction(messageRequest);
                    dialog.sendRequest(ct);


                } catch (Exception ex) {

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                    System.out.println("shootme: got an ACK! ");
                    System.out.println("Dialog State = " + dialog.getState());
                    SipProvider provider = (SipProvider) requestEvent.getSource();


                    Request messageRequest = dialog.createRequest(Request.MESSAGE);
                    CSeqHeader cseq = (CSeqHeader)messageRequest.getHeader(CSeqHeader.NAME);


                    // We will test if the CSEq validation is off by sending CSeq 1 again


                    ClientTransaction ct = provider
                    .getNewClientTransaction(messageRequest);
                    cseq.setSeqNumber(1);
                    ct.sendRequest();


                } catch (Exception ex) {
                    ex.printStackTrace();
                }

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    }


    public synchronized void processResponse(ResponseEvent responseEvent) {
        try {
            Response response = responseEvent.getResponse();
            CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
            logger.info("ClientTxID = " + responseEvent.getClientTransaction() + " client tx id "
                    + ((ViaHeader) response.getHeader(ViaHeader.NAME)).getBranch()
                    + " CSeq header = " + response.getHeader(CSeqHeader.NAME) + " status code = "
                    + response.getStatusCode());


            // JvB: stateful proxy MUST NOT forward 100 Trying
            if (response.getStatusCode() == 100)
                return;


            if (response.getStatusCode() == Response.LOOP_DETECTED) {
              logger.info("Saw a LOOP DETECTED response");
                this.loopDetectedSeen = true;
            }
            if (cseq.getMethod().equals(Request.INVITE)) {
                ClientTransaction ct = responseEvent.getClientTransaction();
                if (ct != null) {
                    ServerTransaction st = (ServerTransaction) ct.getApplicationData();


                    // Strip the topmost via header

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                // Create a new CallId header
                CallIdHeader callIdHeader = sipProvider.getNewCallId();


                // Create a new Cseq header
                CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1L,
                        Request.INVITE);


                // Create a new MaxForwardsHeader
                MaxForwardsHeader maxForwards = headerFactory
                        .createMaxForwardsHeader(70);

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