Thanks for your reply but I think you don't get my point. 1. Here Caller A does not have Supported:100rel but in the INVITE request contains Require:100rel. So now suppose callee B send a RPR whether Caller A will able to generate PRACK because Caller A does not have Supported:100rel
2. One more scenario Caller A send a INVITE request with both Supported:100rel & Require:100rel to callee B. (In Callee B contains Require:100rel but no Supported:100rel. means if any time callee B makes another INVITE to a new Callee C that INVITE request will contain Require:100rel but no Supported:100rel.) So now callee B will send RPR or not as it has the feature Require:100rel but no Supported:100rel? ----- Original Message ---- From: Paul Kyzivat <[EMAIL PROTECTED]> To: Sourav Dhar Chaudhuri <[EMAIL PROTECTED]> Cc: [email protected] Sent: Thursday, 27 March, 2008 8:52:12 PM Subject: Re: [Sip-implementors] For sending PRACK for a RPR is it mandatory to have Supported:100rel in INVITE while it already contains Require:100rel in INVITE Note that Supported talks about what the *sender* of the message containing it supports. Require talks about what the *recipient* of the message containing it (must) support. For some options its possible that only one side need support the option. For others that makes no sense. (One where it does make sense is "timer".) As a result, there is no implied linkage between the two. Put in Supported if *you* support it, and put in Require if you require that the *other guy* support it. Paul Sourav Dhar Chaudhuri wrote: > Hi, > I have a doubt is it mandatory to haveSupported:100rel in INVITE > request while it already contains Require:100rel inINVITE. > > 2. One more question is it possible that a Caller cannot sendPRACK for a > Reliable Provisional Response(RPR) as it contains Require:100relbut no > Supported:100rel in its INVITE request. > > I am asking the second question because if that thesame capability is > present in Callee so whether after receiving any INVITEwith Require:100rel , > whether callee will be not be able to send RPR. > > Thanks > SOURAV DHAR CHAUDHURI > > > > > > > > Did you know? You can CHAT without downloading messenger. Go to > http://in.messenger.yahoo.com/webmessengerpromo.php/ > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > Why delete messages? Unlimited storage is just a click away. Go to http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
