Igor, I made some change in Freeswitch source code to support DTMF conversion based on the SDP negotiation. /Kaiduan On Monday, May 17, 2021, 09:39:52 a.m. EDT, Igor Potjevlesh <igor.potjevlesch@gmail.com> wrote: Yes, exactly. As well as the revert direction if possible: inband from B to telephone-event to A. -----Message d'origine----- De : FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> De la part de kaiduan xie via FreeSWITCH-users Envoyé : mercredi 12 mai 2021 18:17 À : 'FreeSWITCH Users Help' <freeswitch-users@lists.freeswitch.org> Objet : Re: [Freeswitch-users] Detect inband DTMF on B-leg _________________________________________________________________________ The FreeSWITCH project is sponsored by SignalWire https://signalwire.com Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services. Build your next product on our scalable cloud platform. Join our online community to chat in real time https://signalwire.community Professional FreeSWITCH Services sales@freeswitch.com https://freeswitch.com Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://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 https://freeswitch.com -- L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast. https://www.avast.com/antivirus