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Re: [rohc] draft-ietf-rohc-sigcomp-sip-08.txt and stateless compression

cco <cristian.constantin@iptel.org> Thu, 13 December 2007 10:23 UTC

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Date: Thu, 13 Dec 2007 11:23:20 +0100
From: cco <cristian.constantin@iptel.org>
To: Ofer Goren <oferg@radvision.com>
Subject: Re: [rohc] draft-ietf-rohc-sigcomp-sip-08.txt and stateless compression
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References: <FE127977CE269045BBA7EC732F399FD902373255@rvil-mail1.RADVISION.com> <47502EA0.1000304@nostrum.com> <FE127977CE269045BBA7EC732F399FD9023737E1@rvil-mail1.RADVISION.com>
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On Mon, Dec 10, 2007 at 03:49:10PM +0200, Ofer Goren wrote:
> Hi.
> 
> Stateless compression is defined as a compression without compartment.
> Endpoint A, who does not support NACK recieves a compressed message from
> B. Since B used a stateless compression in my example, B does not store
> any states. How can A knows about it?

cristian: you want to say that B is compressing packetwise and NOT
streamwise, right?

why should A know about it? as long as the decompression bytecode sent
by B is suitable for its compression and is working correctly A can
decompress without knowing the compression strategy used by B. (this is
the whole idea behind the UDVM)

otoh a real problem appears when B _uses_ stream (stateful) compression
and A does not support NACK...

bye now!
cristian

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