[Asterisk-Users] DTMF doesn't seem to get through incoming ZAP channels

[Peter Svensson]

On Mon, 21 Mar 2005, Walter Klomp wrote:

> I'm running CVS-HEAD-03/19/05-11:15:15 on Fedora Core 3 with Digium 
> TE410P card.
> 
> Calling into meeting rooms that have been configured with the p option 
> works fine.
> 
>  From ZAP extensions the # key does not work to exit, however from SIP 
> extensions the # key works fine. This makes me believe that somehow the 
> DTMF doesn't get through the ZAP interface. After furter experimenting 
> voicemail also doesn't work through ZAP (the selection of menu-options 
> that is...)

I tried CVS on 2005-03-18 and we found a similar problem with Dial with
the transfer options enabled. The calling phone could transfer but the
called phone could not. Identical phones etc, and the results were the 
same when the two endpoints were interchanged.

We placed debug logging code at various places, including all the way down 
in zt_read in chan_zap. It seems that the dsp code got called, but did not 
detect digits on the outbound leg. Perhaps some state in the dsp code is 
not initialized properly for DTMF detection?

If the called phone was a sip phone set to rfc2833 then transfers work.

I ran out of time to test further and reverted to an older cvs release. 
(Much older).

Peter