I would suggest you try and get hold of an AVM fritz (I got one for £4 off Ebay) card 
and then use chan_capi..

Later..

> 
> 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
> 
> _______________________________________________
> Asterisk-Users mailing list
> [EMAIL PROTECTED]
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