Thanks. Regards, Sunil
-----Original Message----- From: Pandurangan R S [mailto:[email protected]] Sent: Wednesday, January 13, 2010 4:30 PM To: Sunil Bhagat (WT01 - Telecom Equipment) Cc: [email protected]; [email protected]; [email protected]; [email protected] Subject: Re: [Sip-implementors] INVITE Transaction > A UA cannot send a BYE for a call until it has received an ACK for > the initial INVITE. This was allowed in RFC 2543 but leads to a > potential race condition. Probably that should read A UA cannot send a BYE for a call until it has received an ACK for the initial INVITE or *server transaction has timed out*. This was allowed in RFC 2543 but leads to a potential race condition. This is appropriately indicated below (RFC 3261) 13.3.1.4 The INVITE is Accepted If the server retransmits the 2xx response for 64*T1 seconds without receiving an ACK, the dialog is confirmed, but the session SHOULD be terminated. This is accomplished with a BYE, as described in Section 15. 15 Terminating a Session However, the callee's UA MUST NOT send a BYE on a confirmed dialog until it has received an ACK for its 2xx response or until the server transaction times out. On Wed, Jan 13, 2010 at 3:46 PM, <[email protected]> wrote: > Thanks for the reply. > > But the in the RFC (28.1 Major Functional Changes) it is mentioned that: > > A UA cannot send a BYE for a call until it has received an ACK for > the initial INVITE. This was allowed in RFC 2543 but leads to a > potential race condition. > > > Please let me know the correct behavior in this case. > > Thanks and regards, > Sunil > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Iñaki > Baz Castillo > Sent: Wednesday, January 13, 2010 3:42 PM > To: [email protected] > Subject: Re: [Sip-implementors] INVITE Transaction > > El Miércoles, 13 de Enero de 2010, [email protected] escribió: >> Hi, >> >> I have one doubt in this. >> If ACK is not properly sent by the UAC, how will the call be terminated? > >> Will the UAC send a CANCEL > > How can now the UAC that its ACK didn't arrive to the UAS? just by inspecting > the arrival of new 200 responses (same response) which means that the UAS > didn't receive the ACK (or the proper ACK). > > >> or will the other end send a BYE to terminate >> the call? > > The SIP dialog is creted with the INVITE and 200, regardless of the > presence/abscense of the ACK, so the call must be terminated with a BYE (from > the caller or called). > A CANCEL from UAC is not valid as the INVITE was already accepted. > > -- > Iñaki Baz Castillo <[email protected]> > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > Please do not print this email unless it is absolutely necessary. > > The information contained in this electronic message and any attachments to > this message are intended for the exclusive use of the addressee(s) and may > contain proprietary, confidential or privileged information. If you are not > the intended recipient, you should not disseminate, distribute or copy this > e-mail. Please notify the sender immediately and destroy all copies of this > message and any attachments. > > WARNING: Computer viruses can be transmitted via email. The recipient should > check this email and any attachments for the presence of viruses. The company > accepts no liability for any damage caused by any virus transmitted by this > email. > > www.wipro.com > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > Please do not print this email unless it is absolutely necessary. The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
