Would making dsp.c flexible enough to check and recognize user defined tone
sequences in asterisk channel variables be something which could prove
beneficial for several applications?

I can think of a few:

1. Pager prompt tone detection.
2. Burglar alarm central station receivers.
3. Coin telephone denomination detection.
4. SIT tone detection
5. Unusual/Obscure/Special call progress tone detection.

Looking at the code in dsp.c, things are pretty convoluted at the moment
maybe in the longer term we could rewrite it to allow the addition of
user-defined tone sequences.

Steve.

It would also ease the process of making an automated alert system to check on end-to-end status. Every N minutes, an automated process would call several numbers (long distance) which were known to answer with a certain tone set. Then the system would make sure it "heard" those tones, or else it would send of an alarm of suspicious end-to-end failures.


I don't know about the state of dsp.c, but it certainly would be nice to have some more flexibility for detection of tones within the audio stream to trigger Dialplan events. Heck, even just the ability to press keys other than "#" in a conversation would be great! See my notes on what I'm talking about here:

http://lists.digium.com/pipermail/asterisk-dev/2003-November/002185.html

JT
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