[asterisk-bugs] [JIRA] (ASTERISK-25470) SDP version increased when no change in SDP on 183 session progress retransmit

[Morten Tryfoss (JIRA)]

Morten Tryfoss created ASTERISK-25470:
-----------------------------------------

             Summary: SDP version increased when no change in SDP on 183 session progress retransmit
                 Key: ASTERISK-25470
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25470
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 13.6.0, 13.5.0
         Environment: Centos 6
            Reporter: Morten Tryfoss
            Severity: Minor


183 is retransmitted by Asterisk every 60 seconds. The version is bumped even if there are no change in the SDP.

Some equipment terminates the call because of this.

We had a similar error like this earlier, but then asterisk bumped the version on the 200 OK after a 183 session progress.

Reproduce like this:
progressinband=yes

exten => 200,1,Progress
exten => 200,n,Wait(65)

First SDP:
v=0 
o=root 179570363 179570363 IN IP4 192.168.1.50 
s=Nordicom 
c=IN IP4 192.168.1.50 
t=0 0 
m=audio 12914 RTP/AVP 8 97 
a=rtpmap:8 PCMA/8000 
a=rtpmap:97 telephone-event/8000 
a=fmtp:97 0-16 
a=ptime:20 
a=maxptime:150 
a=sendrecv 

Second:
v=0 
o=root 179570363 179570364 IN IP4 192.168.1.50 
s=Nordicom 
c=IN IP4 192.168.1.50 
t=0 0 
m=audio 12914 RTP/AVP 8 97 
a=rtpmap:8 PCMA/8000 
a=rtpmap:97 telephone-event/8000 
a=fmtp:97 0-16 
a=ptime:20 
a=maxptime:150 
a=sendrecv 



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