[Freeswitch-users] DTMF detection in the core & spandsp

[Peter Olsson]

Core DTMF tone detection is disabled by default, and started by using start_dtmf. However DTMF over RFC2833 is always enabled (maybe it's possible to disable, I don't know how though). RFC2833 is not DTMF tone detection, but rather a specially formatted RTP packet.

In your sample you get both inband and RFC2833 events, so that's why I think it's better not to detect inband tones at all, but only use RFC2833. However, if you only get inband you will need to enable DTMF tone detection.

Are you sure they don't support RFC2833 events, according to your log sample they seem to do...

/Peter

________________________________
Från: freeswitch-users-bounces at lists.freeswitch.org [freeswitch-users-bounces at lists.freeswitch.org] för Mi Ke [mi.ke at null.net]
Skickat: den 18 juli 2012 21:59
Till: FreeSWITCH Users Help
Ämne: Re: [Freeswitch-users] DTMF detection in the core & spandsp

Hi Peter,

My goal is to disable core DTMF detection completely and try spandsp instead since duplicate digit detection in the core works bad for me. DTMF in inbound call are inband.

Thanks / Mike




----- Original Message -----

From: Peter Olsson

Sent: 07/18/12 10:29 PM

To: FreeSWITCH Users Help

Subject: Re: [Freeswitch-users] DTMF detection in the core & spandsp



You probably get both inband and RFC2833 DTMF. So don't enable DTMF tone detection at all, and let FS parse out the RFC2833 DTMF events.

/Peter

18 jul 2012 kl. 21:23 skrev "Mi Ke" <mi.ke at null.net<mailto:mi.ke at null.net>>:

Hi All,

Do I need to disable DTMF detection in the core when I use spandsp for the same?

Calling stop_dtmf before spandsp_start_dtmf didn't work for me and when I dial e.g. 0 I get:

2012-07-18 18:47:25.155435 [DEBUG] mod_spandsp_dsp.c:61 DTMF BEGIN DETECTED: [0]
2012-07-18 18:47:25.155435 [DEBUG] mod_spandsp_dsp.c:73 DTMF END DETECTED: [0], duration = 89 ms
2012-07-18 18:47:25.295432 [DEBUG] switch_rtp.c:3457 RTP RECV DTMF 0:2400

which comes to 00 after digit collection completes.

Setting dtmf-type to none in sofia profile didn't help either.

What's the right way of switching to spandsp's DTMF ?

Thanks in advance for all yours hints.

Mike


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