[asterisk-bugs] [JIRA] (DAHLIN-309) fake DTMF or talkoff

[Marlon Costa (JIRA)]

Marlon Costa created DAHLIN-309:
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             Summary: fake DTMF or talkoff
                 Key: DAHLIN-309
                 URL: https://issues.asterisk.org/jira/browse/DAHLIN-309
             Project: DAHDI-Linux
          Issue Type: Information Request
      Security Level: None
          Components: dahdi (the module)
    Affects Versions: 2.6.1
         Environment: DAHDI Version: 2.6.1 Echo Canceller: HWEC, OSLEC
Asterisk 1.8.18.0 i686 running Linux CentOS release 5.8
pci:0000:02:06.0     wct4xxp+     d161:0410 Wildcard TE410P (3rd Gen)
            Reporter: Marlon Costa
            Assignee: Russ Meyerriecks


Hi,
Many of our customers claims a beep when making or receiving calls.
Our tech team enabled debug in our Asterisk and found that this beeps are DTMF tones.
In asterisk logs it's possible see this things many times:

[Dec  5 12:40:13] DEBUG[5764] chan_dahdi.c: Begin DTMF digit: 0x41 'A' on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF begin 'A' received on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF begin passthrough 'A' on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DEBUG[5764] chan_dahdi.c: End DTMF digit: 0x41 'A' on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF end 'A' received on DAHDI/i1/21499100-fab, duration 51 ms
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF end accepted with begin 'A' on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF end 'A' detected to have actual duration 60 on the wire, emulation will be triggered on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF end 'A' has duration 60 but want minimum 80, emulating on DAHDI/i1/21499100-fab
[Dec  5 12:40:13] DTMF[5764] channel.c: DTMF end emulation of 'A' queued on DAHDI/i1/21499100-fab

We done a wireshark capture to find out what is happening and it's possible see an RTP EVENT during these beeps see file attached.

Could you please, help us to solve this issue?

Thanks,
Marlon

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