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 = 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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            try {
                if (response.getStatusCode() == Response.OK
                        && ((CSeqHeader) response.getHeader(CSeqHeader.NAME))
                                .getMethod().equals(Request.INVITE)) {
                    Dialog dialog = tid.getDialog();
                    CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                    Request ackRequest = dialog.createAck(cseq.getSeqNumber());
                    dialog.sendAck(ackRequest);
                }
                if ( tid != null ) {
                    Dialog dialog = tid.getDialog();
                    logger.info("Dialog State = " + dialog.getState());

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                if (response.getStatusCode() == Response.OK
                        && ((CSeqHeader) response.getHeader(CSeqHeader.NAME))
                                .getMethod().equals(Request.INVITE)) {


                    Dialog dialog = responseReceivedEvent.getDialog();
                    CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                    Request ackRequest = dialog.createAck(cseq.getSeqNumber());
                    logger.info("Ack request to send = " + ackRequest);
                    logger.info("Sending ACK");
                    dialog.sendAck(ackRequest);
                }
            } catch (Exception ex) {

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                // 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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                                Request.INVITE)) {
                    this.okRecieved = true;
                    ReInviteBusyTest.assertNotNull("INVITE 200 response should match a transaction",
                            tid);
                    Dialog dialog = tid.getDialog();
                    CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                    Request request = dialog.createAck(cseq.getSeqNumber());
                    dialog.sendAck(request);
                }
                if (tid != null) {
                    Dialog dialog = tid.getDialog();
                    logger.info("Dalog State = " + dialog.getState());

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                    // Request cancel = inviteTid.createCancel();
                    // ClientTransaction ct =
                    // sipProvider.getNewClientTransaction(cancel);
                    Dialog dialog = tid.getDialog();
                    CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                    Request ackRequest = dialog.createAck(cseq.getSeqNumber());
                    logger.info("Ack request to send = " + ackRequest);
                    logger.info("Sending ACK");
                    dialog.sendAck(ackRequest);


                    Thread.sleep(100);

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                // 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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            if (response.getStatusCode() == Response.REQUEST_TERMINATED)
            {
                return;
            }


            CSeqHeader cseqHeader = (CSeqHeader) response
                    .getHeader(CSeqHeader.NAME);


            // No special processing for OK related to SUBSCIRBE and NOTIFY
            if (presenceServer && response.getStatusCode() == Response.OK
                    && cseqHeader.getMethod().equals(Request.SUBSCRIBE))
            {
                return;
            }


            if (presenceServer && response.getStatusCode() == Response.OK
                    && cseqHeader.getMethod().equals(Request.NOTIFY))
            {
                return;
            }


            // 6. Choosing the best response

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        extensionHeader = component.resolveAndRemoveReferenceParameter(parameters, "extensionHeader", ExtensionHeader.class, null);
    }


    public Request createSipRequest(long sequenceNumber, String requestMethod, Object body) throws ParseException, InvalidArgumentException {
        //SipConfiguration configuration = sipPublisher.getConfiguration();
        CSeqHeader cSeqHeader = getHeaderFactory().createCSeqHeader(sequenceNumber, requestMethod);


        // Create the request.
        Request request = getMessageFactory().createRequest(
            getSipUri(), 
            requestMethod,

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                try {
                    if (response.getStatusCode() == Response.OK
                            && ((CSeqHeader) response.getHeader(CSeqHeader.NAME))
                                    .getMethod().equals(Request.INVITE)) {
                        Dialog dialog = tid.getDialog();
                        CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
                        Request ackRequest = dialog.createAck(cseq.getSeqNumber());
                        dialog.sendAck(ackRequest);
                    }
                    if ( tid != null ) {
                        Dialog dialog = tid.getDialog();
                        logger.info("Dialog State = " + dialog.getState());

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