Thanks!
From: ext Sumit Jindal [mailto:[email protected]] Sent: Thursday, November 24, 2011 1:09 AM To: Aman Aggarwal Cc: Pavesi, Valdemar (NSN - US/Irving); [email protected] Subject: Re: [Sip-implementors] UPDATE delay to send 200ok final response Hi Valdemar , I am pasting few lines from 3261. Hope this will clarify your doubt. 17.1.2.1 Overview of the non-INVITE Transaction Non-INVITE transactions do not make use of ACK. They are simple request-response interactions. For unreliable transports, requests are retransmitted at an interval which starts at T1 and doubles until it hits T2. If a provisional response is received, retransmissions continue for unreliable transports, but at an interval of T2. The server transaction retransmits the last response it sent, which can be a provisional or final response, only when a retransmission of the request is received. This is why request retransmissions need to continue even after a provisional response; they are to ensure reliable delivery of the final response. Regards, Sumit Jindal On Thu, Nov 24, 2011 at 11:51 AM, Aman Aggarwal <[email protected]> wrote: Hi Valdemar, That is possible. On receiving 100 Trying, UPDATE retransmissions would stop. However, you have to start a guard timer at application level to handle a scenario when no response is received from the server. regards, Aman Aggarwal Aricent. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Pavesi, Valdemar (NSN - US/Irving) Sent: Wednesday, November 23, 2011 8:59 PM To: [email protected] Subject: [Sip-implementors] UPDATE delay to send 200ok final response Hello , We have to send update to change the session : a) We want it 1 50.987832 10.48.4.2 10.52.39.194 SIP/SDP Request: UPDATE sip:10.52.39.194:5060;transport=UDP, with session description 2 50.987832 10.52.39.194 10.48.4.2 SIP/SDP Status: 200 OK, with session description b) But the remote sip endpoint have a kind of SAVE-GUARD mechanism that will allow to change the session just after 3.5 seconds 1815 50.987832 10.48.4.2 10.52.39.194 SIP/SDP Request: UPDATE sip:10.52.39.194:5060;transport=UDP, with session description 1820 51.491327 10.48.4.2 10.52.39.194 SIP/SDP Request: UPDATE sip:10.52.39.194:5060;transport=UDP, with session description 1824 52.501307 10.48.4.2 10.52.39.194 SIP/SDP Request: UPDATE sip:10.52.39.194:5060;transport=UDP, with session description 1828 53.987731 10.52.39.194 10.48.4.2 SIP/SDP Status: 200 OK, with session description c) Do you think we can have it ? 1815 50.987832 10.48.4.2 10.52.39.194 SIP/SDP Request: UPDATE sip:10.52.39.194:5060;transport=UDP, with session description 1828 50.987835 10.52.39.194 10.48.4.2 SIP/SDP Status: 100 trying . 3.5 seconds later . . 1828 53.987731 10.52.39.194 10.48.4.2 SIP/SDP Status: 200 OK, with session description ++ 21.1.1 100 Trying This response indicates that the request has been received by the next-hop server and that some unspecified action is being taken on behalf of this call (for example, a database is being consulted). This response, like all other provisional responses, stops retransmissions of an INVITE by a UAC. The 100 (Trying) response is different from other provisional responses, in that it is never forwarded upstream by a stateful proxy. ++++ Regards! Valdemar _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors ======================================================================== ======= Please refer to http://www.aricent.com/legal/email_disclaimer.html for important disclosures regarding this electronic communication. ======================================================================== ======= _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors -- Regards, Sumit Jindal _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
