Thank you !

From: Kashif Husain <kashifhusai...@gmail.com>
Sent: den 24 september 2019 00:04
To: Sundbaum Per-Johan (Telenor Sverige AB) <per-johan.sundb...@telenor.se>
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] session refresh

And we can also respond with 200OK as mentioned in rfc3261 with no change in 
our sdp.

"If the user is already a member of the session, and the session

   parameters contained in the session description have not changed, the

   UAS MAY silently accept the INVITE (that is, send a 2xx response

   without prompting the user)."



On Tue, 24 Sep 2019, 03:17 Kashif Husain, 
<kashifhusai...@gmail.com<mailto:kashifhusai...@gmail.com>> wrote:
You can check for SDP version of re-Invite, if its same as previous one then 
its usually intended for session refresh.

Thanks,
-kashif
On Tue, 24 Sep 2019, 02:30 Sundbaum Per-Johan (Telenor Sverige AB), 
<per-johan.sundb...@telenor.se<mailto:per-johan.sundb...@telenor.se>> wrote:
Hi !
Can anybody help me find relevant RFC/other info on how UAS should handle 
re-INVITE that is intended as a session refresh and not for modifying the 
session ?

SDP B1 in (3) is identical with SDP B1 in (5)



                 Caller                        Callee
                   |                             |
                   |                             |
                  |(1) INVITE with SDP A1       |
                   |---------------------------->|
                   |                             |
                   |                             |
                   |(2)  Trying                  |
                   |<----------------------------|
                   |                             |
                   |                             |
                   |(3) 200 OK with SDP B1       |         |
                   |<----------------------------|
                   |                             |
                   |                             |
                   |(4) ACK                      |
                   |---------------------------->|
                   |                             |
                   |                             |
                   |(5) (re)INVITE with SDP B1   |
                   |<----------------------------|
                   |                             |
                   |                             |
                   |(6) 200 OK with SDP ????     |
                   |---------------------------->|


Thanks !
BR/pj



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