Please DO NOT, EVER send a message to both sip and sip-implementors. The people who would answer your questions are subscribed to both lists, and thus they get your email twice. This annoys them, and makes them less likely to help you. Questions about how you implement sip belong on the sip-implementors list. The sip list is used solely for discussing new developments of sip. Brian sip co-chair +AD4- -----Original Message----- +AD4- From: Munira Sharmin +AFs-mailto:msharmin+AEA-worldnet.att.net+AF0- +AD4- Sent: Tuesday, August 14, 2001 12:22 AM +AD4- To: sip-implementors+AEA-cs.columbia.edu +AD4- Subject: +AFs-Sip-implementors+AF0- branch +ACY- tag paramters +AD4- +AD4- +AD4- The questions relate to tag parameter in the From header and branch +AD4- parameter in the Via header. +AD4- +AD4- 1. What is the purpose of the tag in the From header? The +AD4- purpose of the +AD4- tag in the To header is quite clear but SIP bis 04 does not +AD4- seem to be clear +AD4- on the purpose of tag in the From header. +AD4- +AD4- 2. When should a proxy or UAC add the branch parameter in the +AD4- Via header? +AD4- Page 79 and 80 of SIP bis04 talks about computing the branch +AD4- parameter and +AD4- it says +ACI-associate responses with the corresponding request+ACI-. +AD4- In section +AD4- 10.25, where it talks about identifying call legs, there is +AD4- no mention of +AD4- the branch parameter. If a request is forked, the tag in the +AD4- To field serves +AD4- to identify the different responses. So where is the branch +AD4- parameter really +AD4- needed? How is it used? Can someone please give a clear example. +AD4- +AD4- ++AF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXw- +AD4- Sip-implementors mailing list +AD4- Sip-implementors+AEA-cs.columbia.edu +AD4- http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors +AD4- _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
