Exactly. Though I will state something else, I have seen incorrectly coded UACs that behave incorrectly in this regards. In particular, Polycom VVX sets, when they are the refresher, will actually not send out refreshes when they RECEIVE an inbound INFO message from the UAS, as they are recognizing it as a refresh.
FYI: That's a bug, not a feature! :D I do wish that RFC 6086 was a bit more specific. It only states INVITE or UPDATE in-dialog transactions as refreshers, but, nowhere does it state that they are the only ones allowed for refreshing. A little bit of wording change would have saved a lot of headaches. Joel Gerber Network Operations Specialist - Telephone Telephone Eastlink joel.ger...@corp.eastlink.ca T: 519.786.1241 -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Brett Tate Sent: March-27-15 9:21 AM To: isshed; sip-implementors Subject: Re: [Sip-implementors] Sessions Expires with Info INFO has nothing to do with it. To avoid session expiration, a re-INVITE or UPDATE must be used renegotiate (extend, deactivate, et cetera) the expiration time; the corresponding request's 2xx reflects renegotiation result. > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip- > implementors-boun...@lists.cs.columbia.edu] On Behalf Of isshed > Sent: Friday, March 27, 2015 9:07 AM > To: Joel Gerber > Cc: sip-implementors > Subject: Re: [Sip-implementors] Sessions Expires with Info > > Thanks Gerber, > > My query is if on receiving INFO, can the refresh timer be set on UAC > or INFO > does not have anything to do with it. > > On Fri, Mar 27, 2015 at 6:34 PM, Joel Gerber <joel.ger...@corp.eastlink.ca> > wrote: > > It is not mandated either way. It could be sent at any interval between the > last UPDATE/INVITE and 100 seconds. I believe it is recommended, and standard > practice follows, that half-life is when to send it out, but it is not > required. > > > > Joel Gerber > > Network Operations Specialist - Telephone Telephone Eastlink > > joel.ger...@corp.eastlink.ca T: 519.786.1241 > > > > -----Original Message----- > > From: sip-implementors-boun...@lists.cs.columbia.edu > > [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of > > isshed > > Sent: March-27-15 9:02 AM > > To: Brett Tate > > Cc: sip-implementors > > Subject: Re: [Sip-implementors] Sessions Expires with Info > > > > Thanks everyone for the responses. > > > > Brett, > > > > Lets assume the expires value is 100. the Update/Invite will go > > after > > 50 seconds after message (3). right? > > > > Thanks, > > > > On Fri, Mar 27, 2015 at 4:59 PM, Brett Tate <br...@broadsoft.com> wrote: > >>> The INFO can be out of dialog as well. > >> > >> INFO is a mid-dialog request. RFC 6086 section 1. > >> > >> "Use of the INFO method does not constitute a separate dialog usage. > >> INFO messages are always part of, and share the fate of, an invite > >> dialog usage [RFC5057]. INFO messages cannot be sent as part of > >> other dialog usages, or outside an existing dialog." > >> > >> > >>> > I have a scenario where my phone has negotiated with server as > >>> > 60 seconds expires and UAC as refreshers. > >> > >> For completeness, I should mention that the negotiated value is > >> below the absolute minimum mentioned within RFC 4028 section 4. > >> > >> "The absolute minimum for the Session-Expires header field is 90 seconds." > > _______________________________________________ > > Sip-implementors mailing list > > Sip-implementors@lists.cs.columbia.edu > > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
