[asterisk-dev] DTMF detection and generation code

[Greg Boehnlein]

On Mon, 24 Apr 2006, Vahan Yerkanian wrote:

> Ideally,
> 
> I'd like to see a possibility to specify system-wide or per-peer DTMF 
> settings, something like this:
> 
> dtmfduration=200 ; duration in msec, dtmfduration=0 for variable length
> rfc2833count=15 ; number of packets sent, scales both start/stop events
> rfc2833style=sipura ; even more fine tuning, mimic vendor implementation
> 
> This might make our lives much better DTMF-wise IMHO and if we get 
> enough interested people we could even start a bounty to get this done?
> 
> regards,
> Vahan

Actually,
	I think that Kevin's VLDTMF branch, which can accurately detect 
the length of a DTMF Keypress and will eventually be able to send RFC-2833 
Continuation packets will make many of these RFC-2833 problems go away.

One of the things that I have found is that most vendors do not implement 
jitter buffers for RTP Events (which are different from RTP Audio) so 
Asterisk's rapid fire RFC-2833 can cause all sorts of issues. It's fairly 
well detailed on the Bug Tracker and was a significant subject during the 
Developer's conference call last week.

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