Hello Michael, I made some tests with Freeswitch and Fritzbox and found by Wireshark that: within one call
* Freeswitch starts sending 20msec packets, then after ~0,2 second sends 30msec packets * FritzBox always sends 30msec packets. The average jitter is below 2 msec in both directions. The below logs shows that Freeswitch considers the FritzBox to be broken and starts using 30msec packets. But there is no SIP message from FS to Fritzbox telling him that FB will use 30msec packets. SDP from FS to Fritzbox always shows ptime:20 BTW: We can ship you a FritzBox if you need one for testing. Best regards Peter Log: 2009-08-21 17:15:50.271555 [DEBUG] switch_rtp.c:1138 Starting timer [soft] 160 bytes per 20ms 2009-08-21 17:15:50.281563 [INFO] mod_sofia.c:1499 Ring SDP: v=0 o=FreeSWITCH 1250837460 1250837461 IN IP4 182.xxx.xx.xxx s=FreeSWITCH c=IN IP4 182.xxx.xx.xxx t=0 0 m=audio 30290 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:20 a=sendrecv 2009-08-21 17:15:50.281563 [NOTICE] mod_sofia.c:1502 Pre-Answer sofia/internal/02xxxxxx...@fs1.my.domain! 2009-08-21 17:15:50.281563 [DEBUG] switch_core_session.c:630 Send signal sofia/internal/02xxxxxx...@fs1.my.domain [BREAK] EXECUTE sofia/internal/02xxxxxx...@fs1.my.domain playback(voicemail/8000/vm-that_was_an_invalid_ext.wav) 2009-08-21 17:15:50.281563 [DEBUG] switch_ivr_play_say.c:1097 Codec Activated l...@8000hz 1 channels 20ms 2009-08-21 17:15:50.281563 [DEBUG] sofia.c:3302 Channel sofia/internal/02xxxxxx...@fs1.my.domain entering state [early][183] 2009-08-21 17:15:50.281563 [DEBUG] switch_core_io.c:649 sofia/internal/02xxxxxx...@fs1.my.domain receive message [TRANSCODING_NECESSARY] 2009-08-21 17:15:50.531551 [WARNING] mod_sofia.c:799 We were told to use ptime 20 but what they meant to say was 30 This issue has so far been identified to happen on the following broken platforms/devices: Linksys/Sipura aka Cisco ShoreTel Sonus/L3 We will try to fix it but some of the devices on this list are so broken who knows what will happen.. _______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org