[asterisk-dev] Re: Passing DTMF through MeetMe

[Tony Mountifield]

I've had an interesting thread about app_conference with MattF, but
it would be great if one of the experts here could comment on how to
approach the issue using MeetMe.

Thanks in advance
Tony

In article <efdk26$fp3$1 at softins.clara.co.uk>,
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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-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org