[asterisk-bugs] [JIRA] (ASTERISK-27795) chan_sip: one way / no audio with srtp

[Kevin Harwell (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=242965#comment-242965 ] 

Kevin Harwell commented on ASTERISK-27795:
------------------------------------------

I've somewhat confirmed this with a little bit different results. With Asterisk 15 running at commit just prior to 065c300 I saw the following:

srtp->dialpan (playback) - heard audio
srtp->non srtp endpoint - two way audio
srtp->srtp endpoint - two way audio

However, once I updated to commit 065c300 I then saw the below:

srtp->dialpan (playback) - heard audio
srtp->non srtp endpoint - two way audio
srtp->srtp endpoint - one way audio

So there does appear to be a problem.

> chan_sip: one way / no audio with srtp
> --------------------------------------
>
>                 Key: ASTERISK-27795
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27795
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/SRTP
>    Affects Versions: 15.3.0
>            Reporter: Florian Kaiser
>
> Same behavior as described in ASTERISK-27604: 
> One-way audio between srtp and non-srtp clients.
> No audio between two srtp clients.
> No problem with just one client (e.g. echotest).
> Analysis of tcpdump (available on request) reveals that for the srtp stream Asterisk -> client, the wrong - local - encryption key is being used.
> That explains the behaviour: Client can't decode incoming stream -> no audio.
> Git bisect narrows it down to commit 065c300 / ASTERISK-27118.



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