Hi Daniel, Within a network above tech stack is working fine for VOIP calls. But when i am trying from outside there is no sign of RTP. Cmd for rtp - /sbin/rtpengine -p /var/run/rtpengine.pid --interface=192.168.1.249\!106.51.78.78 --listen-ng 127.0.0.1:60000 -m 50000 -M 55000 --log-level 6 --log-facility local1 106.51.78.78 - public ip 192.168.1.249 - priv ip (kamailio + RTPEngine) Kamailio config when call is b/w WebRTC --> WebRTC rtpengine_manage("trust-address replace-origin replace-session-connection direction=internal direction=external"); Here is SDP, captured on the client sitting outside. v=0 o=root 1133801452 1133801452 IN IP4 106.51.78.78 s=Asterisk PBX 16.0.0 c=IN IP4 106.51.78.78 t=0 0 m=audio 50196 UDP/TLS/RTP/SAVPF 0 8 111 9 126 a=maxptime:60 a=ice-ufrag:5e13a1292fc0b7163d49328b7516f763 a=ice-pwd:4fa5e003195492fa165020c81eff9346 a=candidate:Hc0a801ac 1 UDP 2130706431 192.168.1.172 46810 typ host a=candidate:Hc0a801ac 2 UDP 2130706430 192.168.1.172 46811 typ host a=connection:new a=setup:active a=fingerprint:SHA-256 AA:5A:51:BD:4C:53:65:E4:2B:EC:EB:BF:A9:07:DD:60:E3:46:D8:26:6D:04:C8:21:8B:B9:81:37:3A:EB:55:C0 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:111 opus/48000/2 a=rtpmap:9 G722/8000 a=rtpmap:126 telephone-event/8000 a=fmtp:126 0-16 a=sendrecv a=rtcp:50196 a=rtcp-mux a=ptime:20 a=candidate:T7Tqd3oKM4NvATH3 1 UDP 2097152255 106.51.78.78 50196 typ host Looking forward for help from you guys. Thanks & Regards, Arish Haque