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

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=227911#comment-227911 ] 

Asterisk Team commented on ASTERISK-25470:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> 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: 13.5.0, 13.6.0
>         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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