Hi,

You need 
<action application="set" data="execute_on_media=start_dtmf_generate"/>
in dialplan and probably
<param name="dtmf-type" value="none"/>
in sofia profile

Alex

On Thu, Mar 1, 2018 at 12:02 AM, kaiduan xie <kaiduanx@yahoo.ca> wrote:
Hi,

We are encountering the following DTMF issue,

FreeSwitch adds telephone-event support in INVITE to SBC, SBC replies back without telephone-event support in 200. 

However FreeSwitch still sends out DTMF in RFC 2833 event.

I think FreeSwitch should send out DTMF inband instead of 2833 event, what is the configuration for this?

Many thanks for help,

/Kaiduan

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