[asterisk-bugs] [JIRA] (ASTERISK-22789) chan_sip SDP incorrect negotiation for RTP payload types causes DTMF recognization failure and appears to violate RFC

[Matt Jordan (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=215214#comment-215214 ] 

Matt Jordan commented on ASTERISK-22789:
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Just as an FYI, Nitesh has attached a patch that may fix this issue on ASTERISK-23279. If people could go test with that patch and let us know if that fixes this issue, that would be appreciated.

(And no, this issue has not been fixed yet, as the status is still Open.)
                
> chan_sip SDP incorrect negotiation for RTP payload types causes DTMF recognization failure and appears to violate RFC
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-22789
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22789
>             Project: Asterisk
>          Issue Type: Bug
>          Components: Channels/chan_sip/General, Channels/chan_sip/Interoperability
>    Affects Versions: 11.5.1, 11.6.0, 11.7.0
>            Reporter: Pawel Kuzak
>         Attachments: A10_sdp.txt, A11_sdp_1_log.txt, A11_sdp_1.txt, A11_sdp_2_log.txt, A11_sdp_2.txt, sip.conf
>
>
> After upgrading from Asterisk 10 to Asterisk 11 DTMF recognition does not work as expected. I've attached some SDP examples from test calls. 
>  # A10_sdp.txt (Callee is Asterisk 10.12.1)
> Caller sends INVITE with telephone-event 99, Callee answers with telephone-event 99, Caller sends RTP event with 99, DTMF recognition works, everything is fine
>  # A11_sdp_1.txt (Callee is Asterisk 11.5.1)
> Caller sends INVITE with telephone-event 99, Callee answers with telephone-event 101, Caller sends RTP event with 118 (!), DTMF recognition does not work (here the caller is obviously misbehaving as well)
>  # A11_sdp_2.txt (Callee is Asterisk 11.5.1)
> Caller sends INVITE with telephone-event 106, Callee answers with telephone-event 101, Caller sends RTP event with 101, DTMF recognition does not work (note that the payload type 101 in the 200 OK is also assigned for G726-32(!))
> Could you please take a look at it?

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