[asterisk-users] Double DTMF digits sent on IAX native bridge

[Remi Quezada]

Ok that makes sense, but I'm still getting double digits.  It seems to
me that the DTMF digit is getting detected too late.  When the digit is
pressed it seems like asterisk is passing the DTMF digit for a fraction
of a second through the audio path and then sends the digit for however
long your toneduration is set for.  I can hear this happening when I
dial the digits myself, I hear some kind sound being cut off for a
fraction of a second and then hear the DTMF tone pass.  So I guess this
is why sometimes some answer machines are detecting double digits. 

Russell Bryant wrote:
> Remi Quezada wrote:
>> I have two asterisk servers one is connected to the PSTN and the other
>> one is connected to SIP users.  The two servers connect with each other
>> using IAX.  When I have an incoming call from PSTN to the asterisk
>> servers and have a forward to go back out to the PSTN the two IAX
>> channel bridge together.  Now every time I dial a DTMF digit, the
>> asterisk is sending two DTMF digits.  I enable debugging for iax and I
>> do see it sending the DTMF digits two times.  Here is what I see:
>
> The IAX debug that you show below only shows one of each digit.  For
> each one, it shows Receiving the digit from one leg of the call, and
> then transmitting it out the other.  I have spaced out your debug to
> separate each digit.
>
> Each one shows ...
>
>    <----- digit ----
>     ----- ACK ----->
>     ----- digit --->
>     <---- ACK ------
>
> which is exactly what is supposed to happen.
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 018 ISeqno: 021 Type: DTMF    Subclass: 1
>>    Timestamp: 51523ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 019 Type: IAX     Subclass:
>> ACK      Timestamp: 51523ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 019 ISeqno: 022 Type: DTMF    Subclass: 1
>>    Timestamp: 51543ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 020 Type: IAX     Subclass:
>> ACK      Timestamp: 51543ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 019 ISeqno: 021 Type: DTMF    Subclass: 2
>>    Timestamp: 52083ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 020 Type: IAX     Subclass:
>> ACK      Timestamp: 52083ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 020 ISeqno: 022 Type: DTMF    Subclass: 2
>>    Timestamp: 52103ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 021 Type: IAX     Subclass:
>> ACK      Timestamp: 52103ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 020 ISeqno: 021 Type: DTMF    Subclass: 3
>>    Timestamp: 52663ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 021 Type: IAX     Subclass:
>> ACK      Timestamp: 52663ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 021 ISeqno: 022 Type: DTMF    Subclass: 3
>>    Timestamp: 52683ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 022 Type: IAX     Subclass:
>> ACK      Timestamp: 52683ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 021 ISeqno: 021 Type: DTMF    Subclass: 4
>>    Timestamp: 53223ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 022 Type: IAX     Subclass:
>> ACK      Timestamp: 53223ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 022 ISeqno: 022 Type: DTMF    Subclass: 4
>>    Timestamp: 53243ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 023 Type: IAX     Subclass:
>> ACK      Timestamp: 53243ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 021 Type: DTMF    Subclass: 5
>>    Timestamp: 53703ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 023 Type: IAX     Subclass:
>> ACK      Timestamp: 53703ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 023 ISeqno: 022 Type: DTMF    Subclass: 5
>>    Timestamp: 53723ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 024 Type: IAX     Subclass:
>> ACK      Timestamp: 53723ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>
>> Rx-Frame Retry[ No] -- OSeqno: 023 ISeqno: 021 Type: DTMF    Subclass: 6
>>    Timestamp: 54163ms  SCall: 00003  DCall: 00002 [192.168.15.201:4569]
>> Tx-Frame Retry[-01] -- OSeqno: 021 ISeqno: 024 Type: IAX     Subclass:
>> ACK      Timestamp: 54163ms  SCall: 00002  DCall: 00003
>> [192.168.15.201:4569]
>> Tx-Frame Retry[000] -- OSeqno: 024 ISeqno: 022 Type: DTMF    Subclass: 6
>>    Timestamp: 54183ms  SCall: 16385  DCall: 00004 [192.168.15.201:4569]
>> Rx-Frame Retry[ No] -- OSeqno: 022 ISeqno: 025 Type: IAX     Subclass:
>> ACK      Timestamp: 54183ms  SCall: 00004  DCall: 16385
>> [192.168.15.201:4569]
>
>