Ethereal-users: Re: [Ethereal-users] Voip sniffing

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From: Motonori Shindo <mshindo@xxxxxxxxxxx>
Date: Thu, 16 May 2002 00:48:50 +0900 (JST)
Joe,

From: "Joe Aiello" <Joe.Aiello@xxxxxxxxxxxx>
Subject: RE: [Ethereal-users] Voip sniffing
Date: Tue, 14 May 2002 20:59:11 -0700

> If you want to capture just the RTP stream(s), if you could creat a capture
> filter to capture only UDP packets that are 214 bytes, that will get G.711
> packets.  

Not necessarily. Unlike the codec like G.729 and G.723, G.711 doesn't
define a frame size, so it's up to the implementation as to how long
G.711 encoded voice will form a single RTP packet.

Regards,

=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=
 +----+----+     
 |.. .|    |     Motonori Shindo
 |_~__|    |     
 | .. |~~_~|     Sr. Systems Engineer
 | .  |    |     CoSine Communications Inc.
 +----+----+     
 C o S i n e     e-mail:  mshindo@xxxxxxxxxxxxx 
Communications
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