[Freeswitch-users] Sometimes missing a few seconds of audio when CN is offered in INVITE (and solution)

[Anthony Minessale]

Looking at the code, I can see a solution assuming your theory is correct.
I pushed a patch to HEAD if you care to test it.


On Wed, Sep 26, 2012 at 3:26 AM, Peter Olsson <
peter.olsson at visionutveckling.se> wrote:

>  Hello everyone! I experience a strange issue for bridged calls from Lync
> -> FreeSWITCH -> Asterisk, it seems to be related to CN packets. I’m not
> sure if this a bug or not so I ask the question here first.****
>
> ** **
>
> The problem is that the audio back from the Asterisk server is not bridged
> back to the originating client for the first few seconds (how long is
> different on different calls), instead FS seems to send CN-packets back.
> I’ve looked into a wireshark dump, and I see the audio is coming from the
> Asterisk server (using the correct IP and port), but FS doesn’t write the
> same packet to the other call leg (back to Lync), instead it sends a CN
> packet every second or so. My guess is that the timestamp is being handled
> wrong somehow, and FS believes that the real packet is too old (since it
> has already sent a CN packet with a higher timestamp?), and should not be
> written to the other leg, then after a while it sends a new CN packet and
> so on.****
>
> ** **
>
> The solution is to set  “suppress_cng=true” before bridging the call to
> the Asterisk server, when this is done, the audio is always bridged
> correctly, and nothing is missing.****
>
> ** **
>
> I have pcaps of both working calls (with the variable set) and nonworking
> calls, so if you believe it might be something that FS should handle
> differently I’ll submit this to Jira.****
>
> ** **
>
> /Peter****
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
>


-- 
Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
Twitter: http://twitter.com/FreeSWITCH_wire

AIM: anthm
MSN:anthony_minessale at hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888 at conference.freeswitch.org
googletalk:conf+888 at conference.freeswitch.org
pstn:+19193869900
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20120926/8472d95b/attachment.html