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Re: [Linphone-users] Packet Size Control


From: Dragos D
Subject: Re: [Linphone-users] Packet Size Control
Date: Tue, 13 Dec 2011 10:28:33 -0500

You don't increase the frame size,  you just pack more encoded frames in rtp.
Dragos

On Dec 13, 2011 8:47 AM, "Mike Dawson" <address@hidden> wrote:
Dear All,

I have a situation that I think might be common: I want to run SIP
sessions over a VPN.  I am using mostly the speex codec.  The VPN is
running over UDP and the issue is that with a small packet being sent
more frequently the packet overhead is increasing bandwidth usage 2-3x.

So what would be helpful would be to pass a parameter to the codec to
try and increase the frame size so that fewer larger packets go out (and
reduce the overhead loss).

I noticed:

http://lists.gnu.org/archive/html/linphone-developers/2010-04/msg00078.html

But not sure if that applies to audio only - looks like according to
speex doc this should be possible:

http://www.speex.org/docs/manual/speex-manual/node13.html

Does anyone have any hints on where to look for module parameters or
what to do if they don't yet exist - I guess I would have to modify some
source.

Many Thanks,

-Mike

14:24:08.996504 IP user2-Aspire-S3.local.36666 >
static.1.2.3.4.clients.your-server.de.openvpn: UDP, length 141
14:24:08.996647 IP6 fe80::76de:2bff:fe3d:7b08.mdns > ff02::fb.mdns: 0
PTR (QM)? 254.255.128.10.in-addr.arpa. (45)
14:24:08.996792 IP user2-Aspire-S3.local.36666 >
static.1.2.3.4.clients.your-server.de.openvpn: UDP, length 125
14:24:08.996825 IP user2-Aspire-S3.local.mdns > 224.0.0.251.mdns: 0 PTR
(QM)? 254.255.128.10.in-addr.arpa. (45)
^C14:24:09.096979 IP ASUS.local.63816 > 239.255.255.250.1900: UDP,
length 133


14:24:56.316471 IP user1-Satellite-A300.local.7078 >
user2-Aspire-S3.local.7078: UDP, length 18
14:24:56.341113 IP user2-Aspire-S3.local.7078 >
user1-Satellite-A300.local.7078: UDP, length 58
14:24:56.345263 IP user1-Satellite-A300.local.7078 >
user2-Aspire-S3.local.7078: UDP, length 18
14:24:56.355261 IP user1-Satellite-A300.local.7078 >
user2-Aspire-S3.local.7078: UDP, length 18
14:24:56.362484 IP user2-Aspire-S3.local.7078 >
user1-Satellite-A300.local.7078: UDP, length 58




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