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Re: [Linphone-users] Detect audio input for DTMF in linphonec to dial fr


From: Simon Morlat
Subject: Re: [Linphone-users] Detect audio input for DTMF in linphonec to dial from proxy
Date: Tue, 16 May 2006 10:33:12 +0200
User-agent: KMail/1.9.1

Hello,

It is possible to integrate a dtmf detector in linphone/linphonec.
It's not easy. You have to create a MSFilter to scan for dtmfs (I hope you 
have signal processing skills), and put it in the stream defined in 
mediastreamer/audiostream.c after the decoder.
Simon

Le Lundi 15 Mai 2006 03:40, Raju Abhyankar a écrit :
> Hello,
>
> I have installed Linphonec (console version)on an ARM
> based system. I can register with a proxy and then use
> a keyboard to place calls to extensions in this proxy.
> I am trying to create a ATA or "Analog telephone
> adapter" type device and so would not have a computer
> keyboard in such a setup. Instead I would now connect
> a regular analog telephone via a SLIC chip to the ARM
> board. The issue is now once the ARM based system
> registers with the proxy, to dial say an extension 0
> of this proxy, I can only signal via DTMF tones from
> the phone and they would be carried along with the
> audio signal coming also on the "line in" or
> microphone channel. This is because the phone has a
> dial pad and it sends DTMF tone along with the audio.
>
> The question is, is there a way for linphonec (console
> version) to detect and decode "in audio band" DTMF and
> then generate a call to extension using the detected
> DTMF? If some one has such a solution or a possible
> answer please let me know.
>
> regards,
>
> Raju
>
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