[asterisk-bugs] [JIRA] (ASTERISK-22792) chan_sip SDP incorrect negotiation for RTP payload types causes DTMF recognization failure and appears to violate RFC

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-22792:
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             Summary: chan_sip SDP incorrect negotiation for RTP payload types causes DTMF recognization failure and appears to violate RFC
                 Key: ASTERISK-22792
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22792
             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


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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