Freeswitch is at ip address 192.168.0.27 My softphone #1 is registered with freeswitch as user 1005. It is at ip address 192.168.0.30 My softphone #2 is registered with freeswitch as user 1006. It is at ip address 192.168.0.16 1005 calls 1006 using OPUS codec. The call does not succeed because the media stream (audio only in my case) initially established between FS and the caller 1005 is interrupted after FS has setup the communication with callee 1006 and sent the SIP OK to caller 1005. All other media streams are correctly established. I got this behaviour only with OPUS codec. It works correctly with G722 codec for instance. I tried with freeswitch 1.8.7 under windows and freeswitch 1.10.7 under linux and got the same result. I tried different freeswitch settings with the same result. Can someone help me to solve this problem? I don't know where to look anymore. I attached a wireshark capture. It shows that FS is not sending media packets anymore to 1005 (192.168.0.3) after it has sent the SIP OK (packet #2360). I also attached freeswitch log.