[Sip] Branch in INVITE ,ACK,BYE
ABDUL SATTAR SHAIK <abdulss@migv.mot.com> Fri, 20 September 2002 12:55 UTC
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From: ABDUL SATTAR SHAIK <abdulss@migv.mot.com>
To: "'sip@ietf.org'" <sip@ietf.org>
Date: Fri, 20 Sep 2002 18:19:22 +0530
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Subject: [Sip] Branch in INVITE ,ACK,BYE
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The branch parameter should change with each request send by UAC or per Transaction Basis. If it is on transaction basis INVITE and ACK should have same branch parameter In RFC 3261 Examples The branch parameter is different for INVITE and ACK message sent By UAC 24.2 Session Setup This example contains the full details of the example session setup in Section 4. The message flow is shown in Figure 1. Note that these flows show the minimum required set of header fields - some other header fields such as Allow and Supported would normally be present. F1 INVITE Alice -> atlanta.com proxy INVITE sip:bob@biloxi.com SIP/2.0 Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bKnashds8 Max-Forwards: 70 To: Bob <sip:bob@biloxi.com> From: Alice <sip:alice@atlanta.com>;tag=1928301774 Call-ID: a84b4c76e66710 CSeq: 314159 INVITE Contact: <sip:alice@pc33.atlanta.com> Content-Type: application/sdp Content-Length: 142 (Alice's SDP not shown) ACK sip:bob@192.0.2.4 SIP/2.0 Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bKnashds9 Max-Forwards: 70 To: Bob <sip:bob@biloxi.com>;tag=a6c85cf From: Alice <sip:alice@atlanta.com>;tag=1928301774 Call-ID: a84b4c76e66710 CSeq: 314159 ACK Content-Length: 0 Thanks in Advance Abdul Sattar
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