[Freeswitch-users] Need a help with start_dtmf

[Brian West]

I highly suspect you receive phone calls from providers that don’t support RFC2833, fun thing is some providers do send 2833 but never say telephony-event in the SDP on the invite… which is silly.  If you look at the default dial plan in FreeSWITCH you’ll see this:

      <condition field="${switch_r_sdp}" expression="a=rtpmap:(\d+)\stelephone-event/8000" break="never">                                                       
        <action application="set" data="rtp_payload_number=$1"/>                                                                                                
        <anti-action application="start_dtmf"/>                                                                                                                 
      </condition>  

This will look at the SDP and toggle on start_dtmf if no telephony-event is present in the inbound invite.

--
Brian West
brian at freeswitch.org
FreeSWITCH Solutions, LLC
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On Feb 19, 2014, at 1:53 AM, Yigal Rachilevsky <yigalr01 at gmail.com> wrote:

> Hello !
> 
> I am a new in Freeswitch..
> I need a help with start_dtmf parameter
> 
> We have IVR system (Telephone Reporting System)
> Some times in incoming calls Freeswitch misses some key presses (DTMF)
> I guess that the problem is the detection of DTMF...
> I use in (external.xml)
> <param name="dtmf-type" value="rfc2833"/>
> 
> Where I need to add start_dtmf parameter for detecting in-band DTMF ?
> We are using  dialplan.xml file located in root of conf folder
> <?xml version="1.0" encoding="utf-8"?>
> <include>
>   <context name="public">
>   <extension name="SYFreeSwitch">
>   <condition field="destination_number" expression=".*">
> <action application="start_dtmf" />
>   <action application="managed" data="SYFreeSwitch"/>
>   </condition>
>   </extension>
>   </context>
> </include>
> 
> It's right place for it ?
> 
> 
> Thank you in advance,
> 
> Yigal
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> 
> 
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