This is addressed in RFC 4320, which also suggests normative updates to RFC 3261. I did not understand the question about Cancel for non-Invite transaction, is that allowed or useful?
Sanjay >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of >Christer Holmberg (JO/LMF) >Sent: Monday, June 04, 2007 8:54 AM >To: [EMAIL PROTECTED]; sip-implementors@cs.columbia.edu >Subject: Re: [Sip-implementors] 100 response for non-INVITE requests > > >Hi Dale, > >I can't speak for others, but I have never heard about crashes >due receiving 100 Trying responses to non-INVITE requests. > >One question, however, is whether 100 Trying responses for >non-INVITE requests have any impact on the re-transmission. > >Another question is what happens if terminals, after receiving >100 Trying for non-INVITE requests, start to send CANCEL... > >Regards, > >Christer > > >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of >> [EMAIL PROTECTED] >> Sent: 4. kesäkuuta 2007 4:19 >> To: sip-implementors@cs.columbia.edu >> Subject: [Sip-implementors] 100 response for non-INVITE requests >> >> We're noticing that when the SIP network gets congested, phones will >> be fairly frantic about resending requests that they do not receive >> (provisional or final) responses for. >> Unfortunately, this only increases the load on the proxy, which does >> not help the situation. >> For INVITEs, the proxy sends 100 responses to stop the phone from >> resending (and to keep it from failing over to another proxy). But >> for non-INVITE requests, 100 responses are SHOULD NOT. >> >> However, we're considering adjusting the proxy so that if it >receives >> a resend of a non-INVITE request (on a non-reliable transport), it >> will send a 100 response to (hopefully) quench the resends. >> >> 1) Will phones respond to 100 responses to non-INVITE requests to >> quench resends? >> >> 2) Will SIP agents behave badly if they receive 100 responses to >> non-INVITE requests? >> >> Dale >> _______________________________________________ >> Sip-implementors mailing list >> Sip-implementors@cs.columbia.edu >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > >_______________________________________________ >Sip-implementors mailing list >Sip-implementors@cs.columbia.edu >https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
