[asterisk-users] Callback DTMF Problem

[Wolfgang Liegel]

Hi,
I have a similar problem:
when I initiate a callback to a local SIP phone no DTMF information is passed to asterisk.
When the same phone (Grandstream GXP2000) is called from the same asterisk server with the same settings via an external SIP Gateway (Cisco) DTMF works.
I already tried to use in-band as well as rfc2833 and info on both endpoints.
It seems to be a callback related issue, because, when I directly call the callback-extension, DTMF works.

Wolfgang

> 
> I don't understand where is the problem...
> I have Callback setup and it works fine when tested within US. Works
> fine meaning the DTMF tones are passed when prompted to enter the phone
> number. But when I test with some international countries, callback
> works but DTMF tones are not passed...
> 
> Is it: -
>     a) Asterisk problem?
>     b) Callback problem?
>     c) VoIP provider problem?
> 
> 
> Under sip.conf I have "dtmfmode = auto".
> 
> Please help...
> 
> Cheers,
> Nitesh
> 
> 
> 
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