Alex, Can you show the configuration example in vanilla configuration? I could not find out the example. To refresh your memory, I need to setup Freeswitch to send DTMF based on 200 SDP answer in B call leg. 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. The call is a bridged call and DTMF always comes from A call leg in rfc2833. Many thanks for help, /Kaiduan On Tuesday, March 6, 2018, 6:28:22 p.m. EST, Alexey Sibyakin <alex@freeswitch.com> wrote: Yes, it's possible. Vanilla config has example. Alex On Fri, Mar 2, 2018 at 12:39 AM, kaiduan xie <kaiduanx@yahoo.ca> wrote: 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 ______________________________ ______________________________ _____________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www. freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch. org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists. freeswitch.org http://lists.freeswitch.org/ mailman/listinfo/freeswitch- users UNSUBSCRIBE:http://lists. freeswitch.org/mailman/ options/freeswitch-users http://www.freeswitch.org -- Alex Sibyakin | Support EngineerFreeSWITCH Solutions | 17345 Civic Drive #2531 Brookfield, WI 53045Email: alex@freeswitch.comWebsite: https://www.FreeSWITCH.comNeed commercial support? Contact sales@freeswitch.com f or details. ______________________________ ______________________________ _____________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www. freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch. org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists. freeswitch.org http://lists.freeswitch.org/ mailman/listinfo/freeswitch- users UNSUBSCRIBE:http://lists. freeswitch.org/mailman/ options/freeswitch-users http://www.freeswitch.org ______________________________ ______________________________ _____________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www. freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch. org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists. freeswitch.org http://lists.freeswitch.org/ mailman/listinfo/freeswitch- users UNSUBSCRIBE:http://lists. freeswitch.org/mailman/ options/freeswitch-users http://www.freeswitch.org -- Alex Sibyakin | Support EngineerFreeSWITCH Solutions | 17345 Civic Drive #2531 Brookfield, WI 53045Email: alex@freeswitch.comWebsite: https://www.FreeSWITCH.comNeed commercial support? Contact sales@freeswitch.com for details. _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org