[Asterisk-Users] DTMF Simultaneous Inband and RFC2833 performed by Asterisk => Duplicate tones

[vladk at voicevia.net]

Hi.
DTMF recognition could be device problem.
For example I have a setup which confirm that:
However I stuck and don't know in what direction to continue.
Have such schema:

Asterisk <-> sipura3000 <-> Land Line.

When call comes from cellphone spa3k captures DTMF and in debug from 
spa3k I see
first digit doubled almost each time.

Jan 19 12:44:26 192.168.162.30 FXO:Digit=1
Jan 19 12:44:26 192.168.162.30 AUD:Stop PSTN Tone
Jan 19 12:44:26 192.168.162.30 FXO:Digit=1
Jan 19 12:44:26 192.168.162.30 AUD:Stop PSTN Tone
Jan 19 12:44:26 192.168.162.30 FXO:Digit=0
Jan 19 12:44:26 192.168.162.30 AUD:Stop PSTN Tone
Jan 19 12:44:27 192.168.162.30 FXO:Digit=1
Jan 19 12:44:27 192.168.162.30 AUD:Stop PSTN Tone
Jan 19 12:44:28 192.168.162.30 FXO:Digit=0
Jan 19 12:44:28 192.168.162.30 AUD:Stop PSTN Tone

On cell phone typed 1010 during Asterisk IVR.
BTW, tried on different celphones from different GSM providers.

Thanks in advance for any advices.


Quoting "Kevin P. Fleming" <kpfleming at digium.com>:
> Max Glucksmann wrote:
>
>> - RFC2833 standard configured on both end-points.
>
> If this is the case, but the end sending DTMF _also_ puts it inband,
> then it is broken. This is an either/or setting; it's either inband or
> out of band, but not both.
>
> Asterisk sometimes listens for inband DTMF even when RFC2833 has been
> specified because the SDP tells us what the peer wants to _RECEIVE_, not
> necessarily what it will send. There are devices out there that will
> tell us they want RFC2833 but send only inband... many devices are just
> broken and/or inconsistent.
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