[Freeswitch-users] DTMF not passing from the A Leg to the B Leg

Bote Man botelist at gmail.com
Wed Feb 24 15:56:32 UTC 2021

Well, that’s a new one!


I’d be happy to document it in the wiki if someone can provide a useful description of what it controls.






John Boteler 

BnC Group U.S.A. 




From: FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org> On Behalf Of Dragos Oancea
Sent: Wednesday, 24 February, 2021 03:31
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] DTMF not passing from the A Leg to the B Leg


Try setting channel variable "sensitive_dtmf" to true.


On Mon, Feb 22, 2021 at 7:17 PM Keith Croxford <keithxcroxford at gmail.com <mailto:keithxcroxford at gmail.com> > wrote:

I'm coming across a strange, intermittent behavior with RFC2833 DTMF packets. This is occurring in a production environment, and I've been able to duplicate this with a very minimal FreeSWITCH installation in a virtual machine. 

Details of the problem: 

A customer occasionally has a problem report where their callers are unable to use the IVR menu. From the user's standpoint, the digits are not detected. Upon further review, we do receive DTMF event packets from the carrier, however, they do not traverse the bridge from the A leg to the B leg.  


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