Hello, As outcome to my earlier sdp/rtp challenges I've upgraded my Asterisk version to 11.11.0 and still use a realtime integration with Kamailio. Now I face a somewhat different problem. With my setup I also changed from jssip client to a sip.js client in my websocket implementation. I cloned the latest rtpengine from git today. I had to revert my Asterisk settings a bit, Asterisk was taking over with sdp handling, I don't know if this is relevant but that's why I got calls seemingly working before. When getting the 488 Not Acceptable, I arm a branch route and call rtpengine_offer there. When trying to call rtpengine_offer, I get the following log: (first I print the rtpengine_offer_flags to make sure what is passed to the function. Aug 15 15:04:16 u363id562 kamailio[32178]: INFO: <script>: MANAGE_RTPENGINE_BRANCH: rtpengine_offer_flags = rtcp-mux-demux trust-address replace-origin replace-session-connection ICE=remove RTP/AVP Aug 15 15:04:16 u363id562 kamailio[32178]: WARNING: <core> [rvalue.c:1016]: rval_get_int(): automatic string to int conversion for "rtcp-mux-demux trust-address replace-origin replace-session-connection ICE=remove RTP/AVP" failed Aug 15 15:04:16 u363id562 kamailio[32178]: WARNING: <core> [rvalue.c:1920]: rval_expr_eval_int(): rval expression conversion to int failed (1128,32-1128,32) Aug 15 15:04:16 u363id562 rtpengine[32159]: Got valid command from 127.0.0.1:44292: delete - { "call-id": "k7bft3u75p5e42ib039r", "received-from": [ "IP4", "client_public_address" ], "from-tag": "74dovi97bi", "command": "delete" } Aug 15 15:04:16 u363id562 rtpengine[32159]: [k7bft3u75p5e42ib039r] Call-ID to delete not found Aug 15 15:04:16 u363id562 rtpengine[32159]: Returning to SIP proxy: d7:warning38:Call-ID not found or tags didn't match6:result2:oke After this I see another 488 and the loop swirls on until Kamailio runs out of forking capacity. Can You guys explain why is this happening? I set the variable like this: $avp(rtpengine_offer_flags) = "rtcp-mux-demux trust-address replace-origin replace-session-connection ICE=remove RTP/AVP"; cheers, Olli