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Re: [Linphone-users] limiting RTP size


From: Tracy Briscoe
Subject: Re: [Linphone-users] limiting RTP size
Date: Wed, 27 Nov 2013 03:33:50 +0000

Hi Anthony

 

Unfortunately I don’t know how to force certain QoS information.  I’m running Linphone 3.6.1 on Windows 8.1.  With the testing I was on a busy wireless network which results in some packets being lost.

 

If you look at the debug log you’ll see entries like the following:

  message: MSQosAnalyser: lost_percentage=0.000000, int_jitter=15.125000 ms, rt_prop=0.037338 sec

  message: MSQosAnalyser: everything is fine.

  message: MSBitrateController: current state is Init

If the lost percentage is high linphone increases the ptime, if there hasn’t been any loss for a while it decreases ptime

 

Sorry I can’t be of more help.

 

Regards,

Tracy Briscoe

 

From: linphone-users-bounces+address@hidden [mailto:linphone-users-bounces+address@hidden On Behalf Of Anthony Ching
Sent: Wednesday, 27 November 2013 4:08 p.m.
To: address@hidden
Subject: Re: [Linphone-users] limiting RTP size

 

Hi Tracy,

I also want to test the voice quality under different ptime parameter.
Would you advise how to change QoS information, so that I make a longer RTP (ie.. lower bandwidth) ?

rgds,
Anthony

> From: address@hidden
> To: address@hidden
> Date: Wed, 27 Nov 2013 00:41:30 +0000
> Subject: [Linphone-users] limiting RTP size
>
> Hi
>
> I have been running some tests with Linphone running on a wireless laptop as an extension of a NEC Univerge SV8100 PABX. For the tests I've used the G.711 codec.
>
> Linphone is smart in that it changes the packet size based on QoS information, however it appears that the PABX ignores RTP packets of 534bites or longer, ie Ptime=60 or greater.
> Is it possible to limit the Ptime/packet size? I've tried setting the Maximum Transmission Unit to 512 but this was ignored.
>
> Regards,
>
> Mr Tracy Briscoe
> Network Engineer
>

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