[Freeswitch-users] Use inband dtmf only

[Oleg Stolyar]

I am having a similar issue with a provider that only supports inband
DTMF.  About half the time DTMF does not reach FS (or does not register).

I was wondering if enabling jitter buffer on FS might help with this.
Anyone has experience with it?

On Sun, Feb 12, 2017 at 12:46 AM, Nikolay Zaytsev <nzaytsevc at gmail.com>
wrote:

> Hello,
>
> I have a problem with an inbound provider: sometimes dtmfs do not reach
> the freeswitch.
> Provider told me that occurred because I am using G711 with rfc2833, and I
> should use only G711.
>
> Inbound call from the carrier to FreeSwitch:
>
> SDP in the INVITE carrier --> FreeSwitch
> v=0
> o=Sansay-VSXi 188 1 IN IP4 x.x.x.x
> s=Session Controller
> p=+X XXXXXXXX
> c=IN IP4 x.x.x.x
> t=0 0
> m=audio 17774 RTP/AVP 18 0 8 101
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=ptime:20
>
> SDP in the 200 OK message from FreeSwitch-->carrier:
>
> v=0
> o=FreeSWITCH 1486794789 1486794790 IN IP4 x.x.x.x
> s=FreeSWITCH
> c=IN IP4 x.x.x.x
> t=0 0
> m=audio 30088 RTP/AVP 0 101
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=ptime:20
>
>
> Carrier wants me to get rid of those session attributes in my 200 OK
> message:
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> and media to be like this
> m=audio 30088 RTP/AVP 0.
>
> Could you please advise me how to do it?
>
> I have already tried to set up
> dtmf-type=none and liberal-dtmf=false in SIP profiles, dtmf_type=none in
> Dialplan. In addition I tried start_dtmf before application answer.
> Also in the vars.xml I specified to use PCMU and PCMA only for both
> global_codec_prefs and outbound_codec_prefs.
>
> My dialplan instruction for inbound call:
>
>  <extension name="inbound_call" continue="false">
>             <condition field="destination_number" expression="^79" >
>                 <action application="answer"/>
>                 <action application="sleep" data="1000"/>
>                 <action application="socket" data="127.0.0.1:8800 async
> full"/>
>             </condition>
>         </extension>
>
> Im using several FreeSwitch boxes, one of them is 1.6.2 version another
> one is 1.6.14, but this problem occurres on both.
>
> Thank you for your time and best regards,
> Nikolay Zaytsev
>
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