Alex,

Thanks for the help.

With <param name="dtmf-type" value="none"/> in sofia profile, the offer from FreeSwitch does not add telephone event support.

With <action application="set" data="execute_on_media=start_ dtmf_generate"/>, FreeSwitch always sends DTMF inband even the offer from FreeSwitch and answer both supports telephone event.

What I want is DTMF negotiation as below,

FreeSwitch always adds telephone event support in offer,

1. If answer supports telephone event, then FreeSwitch sends DTMF in rfc2833.

2. If answer does not support telephone event, then FreeSwitch sends DTMF inband.

Is it possible?

Thanks again.

/Kaiduan

On Thursday, March 1, 2018 3:22 AM, Alexey Sibyakin <alex@freeswitch.com> wrote:

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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