[Freeswitch-users] Quiet packets on non-bypass media calls

Jerry Richards jerry.richards at teotech.com
Thu Feb 10 23:27:10 MSK 2011

Is cng_plc and execute_on_originate documented in the Wiki or somewhere?

-----Original Message-----
From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: Thursday, February 10, 2011 10:39 AM
To: FreeSWITCH Users Help
Cc: Bob Greaby
Subject: Re: [Freeswitch-users] Quiet packets on non-bypass media calls

The packets are probably late and being dropped and replaced with silence.
You can try 2 things:

1) run the app cng_plc before bridge and in execute_on_originate on b legs.
2) enable the jitter buffer at a small value by setting jitterbuffer_msec=60

On Thu, Feb 10, 2011 at 12:15 PM, Jerry Richards <jerry.richards at teotech.com> wrote:
> Hello All,
> All of our Freeswitch installations transmit occasional quiet packets 
> in calls when the media is not bypassed.  One case that is easy to 
> analyze is two phones on a meet-me conference.   Packets containing a 
> continuous tone can be seen being transmitted from a phone to Freeswitch with Wireshark.
> The media stream to the other phone from Freeswitch has occasional 20 
> millisecond packets with near zero amplitude.  This is also seen on 
> PRI calls and in voicemail recordings.  It looks like Freeswitch is 
> ignoring a packet that it received.  The jitter, sequence number, and 
> timestamps of all packets are good.  This occurrence rate is similar 
> on switches with only two phones and on more heavily loaded switches.  
> The rate can be anywhere between no occurrences in an hour to 20 in a minute.
> The drop outs are easy to detect when a continuous tone is being sent 
> by one phone.  The drop outs are more difficult to detect in normal conversation.
> The servers have fast quad core processors and 4 to 6 gigabytes of 
> RAM.  The latest builds of Freeswitch and 32 or 64 bit versions of 
> Centos 5.3 are used.
> Does anyone know what might cause this?
> Thanks,
> Jerry
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Anthony Minessale II

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