[Freeswitch-users] DTMF from cell phones

[Angel Carpintero]

I had some issues with some previous versions of FS , in trunk looks
that is fixed. ( Notice current svn revision is 10609 )

in sip profiles i have :

...
<param name="rfc2833-pt" value="101"/>
<param name="dtmf-duration" value="100"/>
<param name="codec-prefs" value="$${global_codec_prefs}"/>
<param name="use-rtp-timer" value="true"/>
<param name="rtp-timer-name" value="none"/>
<param name="inbound-codec-negotiation" value="greedy"/>
...

As codecs g711 ULAW (PCMU):

in vars.xml.conf :

<X-PRE-PROCESS cmd="set" data="global_codec_prefs=PCMU,PCMA,GSM"/>

So i guess that using latest version with a few changes in your config 
should work unless there's any other issue related to your sip provider
( PSTN / Media Gateway ), on this case you can get some captures of
sip/rtp traffic to check SDP and rtp Marks.

El vie, 05-12-2008 a las 12:08 +0100, Jan Kubr escribió:
> Hi,
> recently someone was mentioning an issue with DTMF here, but there was
> no solution. I have a similar problem, when calling Freeswitch from my
> cell phone (via a SIP provider), sometimes DTMF is not recognized
> (read app doesn't terminate). I could not find any regularity in this,
> sometimes it is recognized just fine, sometimes I had to wait for the
> file to be played etc. The important thing to note is that when using
> a SIP softphone (X-Lite) I have never had this problem, DTMF is
> recognized perfectly. So it's probably related to GSM or something.
> 
> I was wondering whether anyone experienced the same and whether there
> is something I can do about it. There are a few DTMF-related variables
> in the config files (dtmf-duration, pass-rfc2833, rfc2833-pt,
> dtmf-type, default_dtmf_duration, max_dtmf_duration) and I played with
> them a bit, but I don't really know what I'm doing.. Couldn't find any
> docs, either.
> Any ideas would be appreciated.
> 
> Jan Kubr
> 

Cheers,
-- 
Angel Carpintero
ack ( at ) telefonica ( dot ) net

Key fingerprint = 3FD3 9C90 149E 7824 CECD  6BCF AC2C CA61 6EF1 B90D

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