[asterisk-bugs] [JIRA] (ASTERISK-21411) Far end Re-invites Asterisk without SDP (ACKs with SDP) - Asterisk does not modify port of RTP stream - Ignores ACK due to no SDP version change

[Olivier Lambert (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=205517#comment-205517 ] 

Olivier Lambert commented on ASTERISK-21411:
--------------------------------------------

You are completely right: the ContactRoute server was the cause of the issue. It seems that the Asterisk 1.4 was more tolerant and was not "seeing" the issues in the SDP. I tested first with the "ignoresdpversion=yes" setting and could confirm that everything was then working. 
I have then corrected the ContactRoute server (both about version and SDP "o=") to be able to work without the ignoresdpversion=yes.

Thanks a lot for your help and efficiency!

                
> Far end Re-invites Asterisk without SDP (ACKs with SDP) - Asterisk does not modify port of RTP stream - Ignores ACK due to no SDP version change
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-21411
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21411
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/General
>    Affects Versions: 1.8.21.0, 11.2.0
>         Environment: CentOS release 5.9 (Final)
>            Reporter: Olivier Lambert
>            Assignee: Olivier Lambert
>         Attachments: issue21411.zip
>
>
> A re-invite without SDP is causing the voice to be established in one way. The exact same test done on asterisk 1.4.38 is not giving the issue, creating a two ways audio as it should. Pcaps of the two tests are available at http://www.misterlambert.net/pcaps.zip. Reinvite is located at frame 5127 for the 1.4 test while it is located at frame 7897 for the 1.8. The one way audio is caused by the missing RTP flow visible at frame 5166.

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