[asterisk-dev] Passing DTMF through MeetMe

[Matt Florell]

I've been over this one many times. From what I've found the pseudo
zap channels(what all VOIP channels have to use to get into a meetme)
can't do DTMF with any measure of reliability at all. So what I did
was program into app_conference the ability to do DTMF broadcasting of
both inband and RFC DTMF.
http://www.eflo.net/files/VD_app_conference_0.6.zip

It does still have a random double-free memory that I can't find
anyone to fix which will crash Asterisk if you use inband DTMF
broadcasting a lot, but it has worked for me for periods of time as
long as 2 weeks without crashing.

To do DTMF broadcasting, make sure you read the README which has
instructions on the flags for Conference in the dialplan.

MATT---


On 9/27/06, Tony Mountifield <tony at softins.clara.co.uk> wrote:
> I have a system in the field which uses MeetMe to conference parties,
> all of whom are connected via Zap channels on a T1 PRI.
>
> One of the important features the client uses is the ability to press
> DTMF tones on their phone and for the tones to pass out to the other
> party(ies). This is for outgoing calls made using a control screen, that
> arrive on an IVR at the called party. Since MeetMe is invoked without
> any menus enabled, the AST_OPTION_TONE_VERIFY option is not set, and
> the Zap channel allows the in-band DTMF to pass through.
>
> I now need to replicate this functionality for SIP channels (and possibly
> IAX too), where the DTMF arrives at Asterisk already out-of-band
> (e.g. SIP INFO or RFC2833).
>
> I can think of several ways to achieve this, but am not sure which is
> the most correct or achievable:
> - Take the incoming AST_FRAME_DTMF frames in MeetMe and queue them up
>   for output on all other channels in the conference. This assumes they
>   would then be converted back to inband somewhere between Meetme and
>   the remote party. (what happens if you queue an AST_FRAME_DTMF on a
>   Zap channel?)
> - Somehow act on incoming AST_FRAME_DTMF frames by generating the DTMF
>   tones and playing them into the conference.
> - Have the tones converted from out-of-band to inband audio by the
>   incoming channel driver (chan_sip or chan_iax).
>
> Any pointers on the best way to approach this would be gratefully received.
>
> Cheers
> Tony
> --
> Tony Mountifield
> Work: tony at softins.co.uk - http://www.softins.co.uk
> Play: tony at mountifield.org - http://tony.mountifield.org
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