Mahesh, Thanks for the detailed response, very helpful ... --- On Fri, 10/1/10, Maddipatla, Maheswara Rao (Mahesh) <[email protected]> wrote:
From: Maddipatla, Maheswara Rao (Mahesh) <[email protected]> Subject: RE: [Sip-implementors] Question about significance of header(Supported: timer, 100rel) To: "Rashid Shakil" <[email protected]>, [email protected] Date: Friday, October 1, 2010, 10:55 PM Hi Rashid, The Supported header field contains a list of option tags (timer,100rel,replaces,histinfo,join ...)that are understood by the UAC or UAS . If a UAC wants to inform UAS about his capability of supporting/exchanging SIP extensions it will add those in the Supported header and sends in the INVITE message .Supported header doesn't have impact on the call since UAC doesn't insist UAS and its optional as well. Where as Require: header insists UAS and It becomes mandatory for other party to respond . If 100rel is enabled on both ends either calling or called party can include Supported :100rel or Required : 100rel in INVITE or subsequent 1xx message to show that it supports PRACK messages .Refer rfc3262 for PRACK . Thanks Mahesh Maddipatla -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rashid Shakil Sent: Saturday, October 02, 2010 1:03 AM To: [email protected] Subject: [Sip-implementors] Question about significance of header(Supported: timer, 100rel) Greetings, Few quick questions regarding header "Supported: timer,100rel ". What is the significance of this header within INVITE and how it affect voice calls. I also noticed "PRACK" been send and receive if both peering partner (media gateway) and SIP end points has 100rel enabled. Thanks ... Supported: timer,100rel - Rashid Shakil _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
