[asterisk-bugs] [JIRA] (ASTERISK-25214) DTMF over SIP INFO and direct media does not work well together

[Etienne Lessard (JIRA)]

Etienne Lessard created ASTERISK-25214:
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             Summary: DTMF over SIP INFO and direct media does not work well together
                 Key: ASTERISK-25214
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25214
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Bridges/bridge_native_rtp, Channels/chan_sip/General
    Affects Versions: 13.4.0
            Reporter: Etienne Lessard
         Attachments: annotated-sip-debug.txt, extensions.conf, sip.conf

Hello,

There seems to be some problems when using chan_sip with directmedia=yes and dtmfmode=info on asterisk 13.

Given I have two users, Alice and Bob
And Alice calls Bob (via Dial application, with no option)
And Bob answers
When Alice sends a *first* DTMF over SIP INFO
Then Bob does not receive it (i.e. asterisk doesn't sent it)
When Alice sends a *second* DTMF over SIP INFO
Then Bob receives the *first* DTMF, with a duration equals to the time between the first and second DTMF that asterisk received

What this means is that DTMF are not sent "promptly", the last DTMF is always missing, and the duration value of DTMF are unexpected.

I've attached a sip.conf, extensions.conf and an annoted output of the asterisk CLI with "sip set debug on" and DTMF log displayed.

As a note, this used to work correctly on asterisk 11.

Thank you



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