[Freeswitch-users] Force Inband DTMF Reception (SOLVED)

Adrian Worutowicz adrian.worutowicz at esifrance.net
Thu Dec 3 11:32:57 UTC 2020 

Just for the records :

In order to receive DTMS in-band for incoming calls, FS must not send in SDP :

a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16

This is achieved by :

In vars.xml :
<X-PRE-PROCESS cmd="set" data="rtp_liberal_dtmf=false"/>

In sip_profiles\internal.xml and/or  external.xml (Settings):

Add line :
<param name="dtmf-type" value="none"/>

Remove line (if exists) :
<param name="rfc2833-pt" value="101"/>

Big thanks to @seven1240 !


De : FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org> De la part de Piotr Gregor
Envoyé : lundi 30 novembre 2020 16:58
À : FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Objet : Re: [Freeswitch-users] Force Inband DTMF Reception

Cześć Adrian,

Tak, to ma sens. Spróbuj może ustawić flagę dtmf_type=none

<action application="set" data="dtmf_type=none"/>

To powinno sprawić, że w SDP ANSWER nie będzie  a=rtpmap:101 telephone-event/8000, tylko nie jestem pewien czy detekcja in-band DTMF będzie włączona.

pozdrawiam,
Piotr


On Mon, 30 Nov 2020 at 15:34, Adrian Worutowicz <adrian.worutowicz at esifrance.net<mailto:adrian.worutowicz at esifrance.net>> wrote:
Witaj Piotrze,

Co za niespodzianka! 😊

Otóż faktycznie INVITE zawiera:
   v=0
   o=BroadWorks 210259115 1 IN IP4 xxx.xxx.xxx.xxx
   s=-
   c=IN IP4 xxx.xxx.xxx.xxx
   t=0 0
   m=audio 62810 RTP/AVP 8 18 101
   a=fmtp:18 annexb=no
   a=rtpmap:18 G729/8000
   a=rtpmap:101 telephone-event/8000
   a=ptime:20


Zaś  SIP/2.0 200 OK zawiera:
   v=0
   o=FreeSWITCH 1606729402 1606729403 IN IP4 xxx.xxx.xxx.xxx
   s=FreeSWITCH
   c=IN IP4 xxx.xxx.xxx.xxx
   t=0 0
   m=audio 20616 RTP/AVP 8 101
   a=rtpmap:8 PCMA/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=ptime:20

Gateway to ORANGE, także mam tu niewielkie pole manewru.
Powiedzieli mi jednak, że jeśli usunę  a=rtpmap:101 telephone-event/8000, to będzie inband – co jest możliwe, bo w tym połączeniu proponują kodek G729 a ja im na to PCMA no i transmisja jest w PCMA (G711A).

Także pozostaje pytanie, jak usunąć  tę linię z sekcji SDP wysyłanej przez FS w 200 OK.

Serdecznie pozdrawiam,
Adrian.



De : FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>> De la part de Piotr Gregor
Envoyé : lundi 30 novembre 2020 11:58
À : FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Objet : Re: [Freeswitch-users] Force Inband DTMF Reception

Cześć Adrian,

Tryb w którym FS będzie używał DTMF zależy od trybu który jest oferowany w SDP INVITE.
Zazwyczaj klient jest konfigurowalny, np. w Bria: Preferences -> Calls -> DTMF: Send in-band.
Tak więc upewnij się, że to nie klient żąda RFC 2833.

pozdrawiam serdecznie,
Piotr
[https://drive.google.com/a/dataandsignal.com/uc?id=1lUdzdLjEycxXcGhDz-bKqDX8-AIlZuCq&export=download]

Piotr Gregor
Software Engineer

M: (+44) 07483 866 525     L: (+44) 01256 597 470     www: dataandsignal.com<http://dataandsignal.com>




On Thu, Nov 26, 2020 at 6:03 PM Adrian Worutowicz <adrian.worutowicz at esifrance.net<mailto:adrian.worutowicz at esifrance.net>> wrote:
I tried in the SIP profile:  <param name="dtmf-type" value="none"/>

And in dialplan default.xml / <extension name  I put <action application="set" data="dtmf_type=none"/>
and also I tried <action application="bridge" data="{dtmf_type=none} …

None of those worked.



De : FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>> De la part de Dragos Oancea
Envoyé : jeudi 26 novembre 2020 18:10
À : FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Objet : Re: [Freeswitch-users] Force Inband DTMF Reception

How about if you set channel variable "dtmf_type" to value "none" ?

On Thu, Nov 26, 2020 at 5:59 PM Adrian Worutowicz <adrian.worutowicz at esifrance.net<mailto:adrian.worutowicz at esifrance.net>> wrote:
Hello,

For incoming calls, I want to receive DTMF inband.

FS receives INVITE and at certain stage sends 200 OK with a SDP section, which always contains :

a=rtpmap:101 telephone-event/8000 (what means ‘DTMF in RTP metadata’). Indeed the DTMFs come via RTP.

I tried various FS configuration options to remove that line, without success.

How to do it? How to tell a gateway to send DTMFs inband ?

In advance thank you very, very much,
Adrian.




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_________________________________________________________________________

The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.

Join our online community to chat in real time https://signalwire.community

Professional FreeSWITCH Services
sales at freeswitch.com<mailto:sales at freeswitch.com>
https://freeswitch.com

Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com

FreeSWITCH-users mailing list
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UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
https://freeswitch.com
_________________________________________________________________________

The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
Build your next product on our scalable cloud platform.

Join our online community to chat in real time https://signalwire.community

Professional FreeSWITCH Services
sales at freeswitch.com<mailto:sales at freeswitch.com>
https://freeswitch.com

Official FreeSWITCH Sites
https://freeswitch.com/oss
https://freeswitch.org/confluence
https://cluecon.com

FreeSWITCH-users mailing list
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