Hey Guys, I have recently started playing with the echo application for video calls and found some possible issue (asking here if this is the desired behavior). Scenario: * Call gets connected with echo application, echoing audio just fine. * On reinvite the client sends the following SDP(please note the line with a=fmtp:102 packetization-mode=1): {{{ v=0. o=dan.test 0 1 IN IP4 10.10.10.106. s=-. c=IN IP4 10.10.10.106. t=0 0. m=audio 48576 RTP/AVP 9 96 97 0 8 98 100 5 6 15 101. a=rtpmap:9 G722/8000. a=rtpmap:96 speex/32000. a=rtpmap:97 speex/16000. a=rtpmap:0 PCMU/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:98 iLBC/8000. a=rtpmap:100 speex/8000. a=rtpmap:5 DVI4/8000. a=rtpmap:6 DVI4/16000. a=rtpmap:15 G728/8000. a=rtpmap:101 telephone-event/8000. a=extmap:1 urn:ietf:params:rtp-hdrext:csrc-audio-level. m=video 55774 RTP/AVP 102 99. a=rtpmap:102 H264/90000. a=fmtp:102 packetization-mode=1. a=imageattr:102 send [x=[0-640],y=[0-480]] recv *. a=rtpmap:99 H264/90000. a=imageattr:99 send [x=[0-640],y=[0-480]] recv *. a=nortpproxy:yes. }}} * FreeSWITCH accepts it with 200 OK, returning the following SDP: {{{ v=0. o=Webi 1314226434 1314226435 IN IP4 10.10.10.106. s=Webi. c=IN IP4 127.0.0.1. t=0 0. m=audio 32256 RTP/AVP 9 101. a=rtpmap:9 G722/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16. a=silenceSupp:off - - - -. a=ptime:20. m=video 18750 RTP/AVP 102. a=rtpmap:102 H264/90000. }}} Issue as seen by me: FreeSWITCH remaps the 102 from an offer with packetization=1 to a reply with packetization information missing, therefore defaulting to 0 (default out of RFC). Question: * Is this intentional or just some wrong negotiation of packetization parameter? Is FreeSWITCH not supporting packetization=1? Based on the negotiated stream the client should send now 102 with packetization=0 (as preferred by FreeSWITCH in signaling) and FreeSWITCH should return to the client 99 since 102 with packetization=1 does not look like being supported. My FreeSWITCH version is the latest git compiled yesterday: {{{ /opt/freeswitch/bin/freeswitch -version FreeSWITCH version: 1.0.head (git-8f15bc7 2011-08-23 14-40-44 -0500) }}} Thx in advance for any tip! DanB