[pjsip] In-band DTMF detection

Archie Rosenblum archie at bbsti.com
Thu Aug 20 08:49:01 EDT 2009

Thank you, David.  I'll take a crack at this at some point ,and if I get it
working, I'll share it with the group.

Take care,

-----Original Message-----
From: pjsip-bounces at lists.pjsip.org [mailto:pjsip-bounces at lists.pjsip.org]
On Behalf Of David Clark
Sent: Saturday, August 15, 2009 7:18 PM
To: pjsip list; 'pjsip list'
Subject: Re: [pjsip] In-band DTMF detection

Ok I have not done inband but I have done FFT and they are similar in 
terms of approach.  For inband dtmf check out this algorithm.

Now for how to get the audio data from the conference port source to 
the detection algorithm.  Do this.
Just a memory capture device and every time you get a packet of audio 
data call this dedection function to determine what dtmf's are
present, then you can call your on_dtmf_callback function for a 
seemless interface between inband and non-inband calls.

That is the short answer.

At 01:50 PM 8/15/2009, Archie Rosenblum wrote:
>Content-Type: multipart/alternative;
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>Does anyone have an in-band DTMF solution for pjsip?  I know this 
>question has been raised in the past and I am hoping some 
>crackerjack coder has figured it out and would like to share it with 
>the group.  I've been seeing more and more DTMF converted to in-band 
>through various voip providers and I just not savvy enough to 
>understand how to code this detection in pjsip.
>Any help is appreciated.
>Visit our blog: http://blog.pjsip.org
>pjsip mailing list
>pjsip at lists.pjsip.org

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