[Freeswitch-users] Re- DTMF 2833 issue

[Michael Jerris]

There are vars with the full SDP, you can do a regex condition.  Check the info app to see all the vars you have at your disposal.  There may be a var for the te as well to show the pt.

Mike

> On Oct 10, 2018, at 6:53 PM, Andrew Keil <andrew.keil at visytel.com> wrote:
> 
> To FreeSWITCH Users,
>  
> I have just noticed when making calls internationally to the UK from Australia that the following SDP sometimes happens when the call lands on FreeSWITCH:
>  
> d5f14e47-2156-4236-be16-4eef1b7e9d3d 2018-10-04 06:59:28.819816 [DEBUG] sofia.c:7301 Remote SDP:
> d5f14e47-2156-4236-be16-4eef1b7e9d3d v=0
> d5f14e47-2156-4236-be16-4eef1b7e9d3d o=sbc-uk-mr-dh05a 451499 139728 IN IP4 XXX.XXX.XXX.XXX
> d5f14e47-2156-4236-be16-4eef1b7e9d3d s=sip call
> d5f14e47-2156-4236-be16-4eef1b7e9d3d c=IN IP4 XXX.XXX.XXX.XXX
> d5f14e47-2156-4236-be16-4eef1b7e9d3d t=0 0
> d5f14e47-2156-4236-be16-4eef1b7e9d3d m=audio 62754 RTP/AVP 8
> d5f14e47-2156-4236-be16-4eef1b7e9d3d a=rtpmap:8 PCMA/8000
> d5f14e47-2156-4236-be16-4eef1b7e9d3d a=ptime:20
>  
> This then creates the following message around call answer: 
>  
> d5f14e47-2156-4236-be16-4eef1b7e9d3d 2018-10-04 06:59:28.839799 [DEBUG] switch_core_media.c:5766 No 2833 in SDP. Liberal DTMF mode adding 101 as telephone-event.
>  
> From this point on DTMF is NOT detected by the FreeSWITCH IVR service.  I assume I would then need to use mod_dptools: start_dtmf to detect the DTMF tones within the channel.  Which I am yet to test.
>  
> However my main question is whether there is a channel variable that would enable me to check whether 2833 support is not inside the SDP?
>  
> Regards,
>  
> Andrew Keil 
>  

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