[Freeswitch-users] Choppy voive in conference from fritzbox to freeswitch (ptime:30 msecs)

[Mathieu Rene]

Try setting that in your sip profile:

<param name="rtp-autofix-timing" value="false" />

Thats a feature to work around with devices lying about their ptime in  
their sdp payload.

Mathieu Rene
Avant-Garde Solutions Inc
Office: + 1 (514) 664-1044 x100
Cell: +1 (514) 664-1044 x200
mrene at avgs.ca




On 21-Aug-09, at 11:38 AM, Peter P GMX wrote:

> 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/02xxxxxxxxx at fs1.my.domain!
> 2009-08-21 17:15:50.281563 [DEBUG] switch_core_session.c:630 Send  
> signal
> sofia/internal/02xxxxxxxxx at fs1.my.domain [BREAK]
> EXECUTE sofia/internal/02xxxxxxxxx at 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 L16 at 8000hz 1 channels 20ms
> 2009-08-21 17:15:50.281563 [DEBUG] sofia.c:3302 Channel
> sofia/internal/02xxxxxxxxx at fs1.my.domain entering state [early][183]
> 2009-08-21 17:15:50.281563 [DEBUG] switch_core_io.c:649
> sofia/internal/02xxxxxxxxx at 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..
>
>
>
>
>
>
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