[Freeswitch-users] Unreliable DTMF

Steve Underwood steveu at coppice.org
Fri Jul 26 05:21:53 MSD 2013

The model of cellphone should be irrelevant for these types of issues. 
However, different cellular networks handle DTMF differently. If you see 
different results with different phones, is it because they are on 
different networks.


On 07/25/2013 09:33 PM, Alex Lake wrote:
> I've got an application that doesn't seem to work well with DTMF coming
> in (supposedly using rfc2833) from some phones - notably Samsung S3s.
> I have told my carrier to use rfc2833.
> I have put dtmf-type="rfc2833" into my SIP profile.
> I see "a=fmtp:101 0-16" in the session progress message
> I was wondering what this message "Activate Buggy RFC2833 Mode" means!
> When a normal user hits a DTMF key, we get this in the log:
> 2013-07-25 13:26:19.308267 [DEBUG] switch_rtp.c:3917 RTP RECV DTMF 1:744
> 2013-07-25 13:26:19.308267 [DEBUG] switch_channel.c:471 RECV DTMF 1:744
> Does this all indicate that rfc2833 is working?!
> Anyone else had trouble with S3s?

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