Subject: [AVT] RE: draft-johansson-avt-rtp-shim

From: "Ingemar Johansson S \(LU/EAB\)" <[email-masked]>
Date: Sun, 5 Nov 2006 14:34:49 +0100

Hi

> Message: 4
> Date: Fri, 3 Nov 2006 18:24:52 -0800
> From: Cullen Jennings <[email-masked]>
> Subject: [AVT] draft-johansson-avt-rtp-shim
> To: AVT WG <[email-masked]>
> Message-ID: <[email-masked]>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
> 
> 
> I was wondering how this would compare to just compressing 
> the RTCP with one of the existing compression techniques that 
> would probably already be on a device where this was important.

It will be possible to compress RTCP on IP and UDP layer. This replaces
the 20+12 byte IPv4+UDP overhead with a 3 byte RoHC overhead. 

A minimum compund RTCP packet (SR+SDES(CNAME)) with then have a size of
~100byte. I cannot tell right now if compression of RTCP fields has been
considered in the RoHC standardization but it seems to me that it is not
an option. 

Ingemar

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