Hi Freeswitch gay, I use freeswitch to bridge one incoming call to other target phone number. I use bypass_media mode. So the rtp is not go through the freeswitch, By I notice that When LegB receive 183 or 200 SDP message. Freeswitch change it 2833 telephone-event payload type. and forwarding the message to caller. That make the caller use wrong dtmf payload type to send dtmf What wrong with that? How can fix it? Any information or help is welcome. Thanks Lrobot