Koha, Just now I review the code, and the follong code seems related to what you care, /* Start UAC refresh timer, only when we're not unsubscribing */ timeout = (next_refresh > TIME_UAC_REFRESH) ? next_refresh - TIME_UAC_REFRESH : next_refresh; PJ_LOG(5,(sub->obj_name, "Will refresh in %d seconds", timeout)); set_timer(sub, TIMER_TYPE_UAC_REFRESH, timeout); You may enable trace log. It will help you to trace the sequence. Again, if you read the SIP packet example, you will find what Romain said is correct (that is half of expire time.) Sam -----Original Message----- From: pjsip [mailto:pjsip-bounces@xxxxxxxxxxxxxxx] On Behalf Of pjsip-request at lists.pjsip.org Sent: Wednesday, February 27, 2013 6:07 PM To: pjsip at lists.pjsip.org Subject: pjsip Digest, Vol 66, Issue 132 Send pjsip mailing list submissions to pjsip at lists.pjsip.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org or, via email, send a message with subject or body 'help' to pjsip-request at lists.pjsip.org You can reach the person managing the list at pjsip-owner at lists.pjsip.org When replying, please edit your Subject line so it is more specific than "Re: Contents of pjsip digest..." Today's Topics: 1. Re: pjsip Digest, Vol 66, Issue 129 (Khoa Pham) ---------------------------------------------------------------------- Message: 1 Date: Wed, 27 Feb 2013 17:06:33 +0700 From: Khoa Pham <onmyway133@xxxxxxxxx> To: pjsip list <pjsip at lists.pjsip.org> Subject: Re: pjsip Digest, Vol 66, Issue 129 Message-ID: <CAN+NExGnQ1Wnbbr5N8PrchNaeun3_4AAJ2qVr9zuNLjgVSEy3g at mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Hi Sam, So after 50s, caller can detect that the callee is not available anymore ? How to modify this 50s value ? On Wed, Feb 27, 2013 at 4:42 PM, Sam Cao <yuqun.cao at gmail.com> wrote: > Koha, > > This is keepalive mechanism. Romain is correct. You can read the example in > that RFC. > > Romain, is there any keepalive message between UAC and REGISTRAR? > > Thanks, > > Sam > > -----Original Message----- > From: pjsip [mailto:pjsip-bounces@xxxxxxxxxxxxxxx] On Behalf Of > pjsip-request at lists.pjsip.org > Sent: Wednesday, February 27, 2013 4:44 PM > To: pjsip at lists.pjsip.org > Subject: pjsip Digest, Vol 66, Issue 129 > > Send pjsip mailing list submissions to > pjsip at lists.pjsip.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > or, via email, send a message with subject or body 'help' to > pjsip-request at lists.pjsip.org > > You can reach the person managing the list at > pjsip-owner at lists.pjsip.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of pjsip digest..." > > > Today's Topics: > > 1. Re: What is UPDATE request ? (Khoa Pham) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 27 Feb 2013 15:44:06 +0700 > From: Khoa Pham <onmyway133@xxxxxxxxx> > To: Romain JEZEQUEL <romainjezequel at yahoo.fr>, pjsip list > <pjsip at lists.pjsip.org> > Subject: Re: What is UPDATE request ? > Message-ID: > <CAN+NExEyY4iw8YxKwfW6LAUrN-eQd7_K_eEVQLegbdMU7kD= > 9A at mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Romain, > > I think it is more reasonable to send UPDATE requests every 100s (if my > session expire is 100) ? > What is UPDATE used for, I see it contains no specific information. > > P/S: I even tried setting my session expire header to 120, but UPDATE is > still sent every 50s > > > On Wed, Feb 27, 2013 at 3:26 PM, Romain JEZEQUEL > <romainjezequel at yahoo.fr>wrote: > > > Hi Khoa, > > > > RFC4028 describes the use of RE-INVITE or UPDATE requests to refresh the > > session. > > > > From RFC4028, section 7.4 : > > "If a UAC knows that its peer supports the UPDATE method, it is > > RECOMMENDED that UPDATE be used instead of a re-INVITE." > > > > This is the way it is implemented in PJSIP. > > Sending UPDATE requests every 50s means that your session-expires header > > is set to 100s. > > > > Regards, > > > > Romain > > > > ------------------------------ > > *De :* Khoa Pham <onmyway133 at gmail.com> > > *? :* pjsip list <pjsip at lists.pjsip.org> > > *Envoy? le :* Mercredi 27 f?vrier 2013 8h06 > > *Objet :* [pjsip] What is UPDATE request ? > > > > Hi all, > > > > What is UPDATE request? > > I see that when A call B, the INVITE 200 OK from B indicates that A is > > the refresher. And A send UPDATE request every 50 seconds. > > > > Is UPDATE request related to Session timer (RFC 4028) ? > > > > -- > > Khoa Pham > > HCMC University of Science > > Faculty of Information Technology > > > > _______________________________________________ > > Visit our blog: http://blog.pjsip.org > > > > pjsip mailing list > > pjsip at lists.pjsip.org > > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > > > > > _______________________________________________ > > Visit our blog: http://blog.pjsip.org > > > > pjsip mailing list > > pjsip at lists.pjsip.org > > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > > > > -- > Khoa Pham > HCMC University of Science > Faculty of Information Technology > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > < > http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130227 > /c85e2707/attachment.html> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > ------------------------------ > > End of pjsip Digest, Vol 66, Issue 129 > ************************************** > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... 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