Hi Ranjit My question is: can Session-Expire value be changed by 2xx response or an early update request in call-setup phase?
Errata ID: 4744 : *"A UAC starts by sending an INVITE. This includes a Supported header field with the option tag 'timer', indicating support for this extension.If UAC or UAS knows one negotiation of session timer is ongoing, it SHALL not start a new one."* As it has mentioned that 'it shall not start a new one'. Does it meant not to change the Session-Expire value if it is not below the minimum time? Thanks, Aakash On Fri, Dec 4, 2020 at 11:49 PM Ranjit Avasarala <ranjitka...@gmail.com> wrote: > Hi Akash > > The UAS does respond to INVITE with Supported: timer, with a 4xx if the > interval is too short or responds with a 2xx. Why do you think there > should be an early update? u mean a 1xx response? > > On Fri, Dec 4, 2020 at 12:05 PM akashdeep vishnoi <akashanshu...@gmail.com> > wrote: > >> In initial Invite request, UAC is sending a Session-Expires header. After >> receiving this request, UAS will know that session timer negotiation is >> ongoing. >> Can UAS send an early update with a different value in Session-Expires? >> >> Thanks, >> Aakash >> >> On Fri, 4 Dec 2020, 22:40 Ranjit Avasarala, <ranjitka...@gmail.com> >> wrote: >> >>> Hi Aakash >>> >>> how will UAC or UAS know if another negotiation for session timer is >>> ongoing? do u mean multiple INVITEs are sent from UAC? >>> >>> Regards >>> Ranjit >>> >>> On Fri, Dec 4, 2020 at 11:01 AM akashdeep vishnoi < >>> akashanshu...@gmail.com> wrote: >>> >>>> Hi, >>>> >>>> I have a little confusion in this : >>>> -------------------------------- >>>> Errata ID: 4744 >>>> Status: Reported >>>> Type: Technical >>>> Publication Format(s) : TEXT >>>> Reported By: Chao Wang >>>> Date Reported: 2016-07-19 >>>> >>>> Section 3 says: >>>> A UAC starts by sending an INVITE. This includes a Supported header >>>> field >>>> with the option tag 'timer', indicating support for this extension >>>> >>>> It should say: >>>> A UAC starts by sending an INVITE. This includes a Supported header >>>> field >>>> with the option tag 'timer', indicating support for this extension.If >>>> UAC >>>> or UAS knows one negotiation of session timer is ongoing, it SHALL not >>>> start a new one. >>>> >>>> >>>> >>>> ------------------------------------------------------------------------------- >>>> As per above explanation, I want to know if* Session Expire timer value >>>> can >>>> be changed by UAS/UAC by sending early UPDATE* before Call is >>>> established >>>> when INVITE request already has one timer value. >>>> >>>> Thanks, >>>> Aakash >>>> _______________________________________________ >>>> 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
