[Asterisk-Users] DTMF modes and external IVR systems over ISDN

[Mark Spencer]

Need to be sure the ISDN device can send DTMF.  Can't it be done by just
returning -1 in ast_digit or something?

Mrak

On Fri, 1 Aug 2003, Stefano Finetti wrote:

>
> Hello,
>
> I'm trying to understand why when I make a call from a SIP phone to an
> external number who has an IVR system in which I've to choose some options
> using the dialpad, it does'nt recognise the key pressed and remains still
> waiting for my choose.
>
> I'm tryng using Grandstream 102, and i've tryed with all the 3 modes
> possibile:
>
> Dtmf inband, rfc2833 and INFO (obviously configuring'em also in sip.conf).
>
> I think that's a problem of the ISDN line (used with I4L modem drivers),
> that does'nt pass the DTMF to the end point of the call.
>
> Is there some thing i can do on the conf files or I have to search the
> answer into the source tree?
>
> I googlized a bit and found some patch to isdn_tty (that should solve the
> problem of receiving dtmf from isdn line when calling with a person), but
> unfortunately, the kernel version is different and also correcting a bit the
> patch, it doesn't work for me - i still get errors with patch.
>
> Nothing found for the contrary use: sending dtmf over the isdn to make
> possibile a choice into an external ivr or menu system.
>
> Any link/patch/suggestion?
>
> Without it, my * box will be soon cut off by my boss (i need to set-up our
> pbx ASAP - prior to holidays... :( )
>
> --
> Stefano Finetti
>
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