Re: [Linphone-users] Higher bitrate while using Linphone

[Simon Morlat]

Hello,

First you can give linphone constraints bandwidth: use the connection type 
field in the property box, above the codec list. When set to 56k modem, the 
speex codec will automatically be configured to run at 8kbit/s.
Second, to convert this codec bitrate to an IP bandwidth, you need to take in 
accound IP/UDP/RTP encapsulation : 
rtp has a header of 12 bytes
udp is 8 - not sure
ip is around 40
Speex packets are emitted every 20 ms.
You 've got all the parameters of the problem now.

Simon


Le Mercredi 12 Octobre 2005 17:32, Subhashis Roy a écrit :
> Hi,
> I am using 'linphone' which comes with Debian Sarge (version 1.0.1).
> The party on the other side also uses the same version.
> Given the bitrate of speex-8000 codec, I expect the maximum bitrate to
> be about 24000. Since in the configuration file, all codec except the
> above and '1015' are disabled, the average 'in+out' bytes/sec through
> the otherwise calm network interfaces when both parties are speaking
> should not exceed '3+3' kilobytes/sec. However, I find that it is
> about 10 kilobytes/sec in practice (observed with 'xosview' and
> 'ethereal').
> (Since this is going to increase the cost of VOIP I estimated, I am
> worried about it.)
>
> Is this being observed by anybody ?
> Any idea what could cause this,
> or how to reduce it further while using broadband connection ?
>
> (I do not think using traffic shaper here will be a good option).
>
> Thanks in advance.
>
> Subhashis
>
>
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