Subject: RE: [rohc] "returned feedback item" in NACK

From: "Surtees, Abigail" <[email-masked]>
Date: Thu, 23 Mar 2006 09:01:35 -0000

Hi Cristian,

Yes, it is vitally important that the two communicating SigComp
endpoints have the same definition of compartment.  It is up to the
application to define this mapping.

So far I know of three definitions:

On-going work on the definition for general SIP is being done within
this working group:
<http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-sip-02.txt>

3GPP have specified it in TS 24.229 for IMS

OMA have specified it for PoC (note, the compartment definition is the
same as for IMS but the mandated values for SMS and DMS are different
from those in IMS)

Best regards,

Abbie

> 
> cristian: my impression is that the both devices communicating with
> each other with sigcomp (say a mobile IMS terminal on one side and an
> P-CSCF on the other) have to agree somehow on this compartment mapping
> (i.e. on the TCP connection for example). now, could you 
> please tell me
> how is this agreement performed?
> 
> what I'm trying to say is that is usless that the P-CSCF does 
> this kind
> of mapping but the mobile terminal has no idea about it...
> 
> bye now!
> cristian
> -- 
>  _          | There are many people who use UNIX or Linux  
> (_'_        | who IMHO do not understand UNIX.
>   (_'rist   |              --David Korn  
> GPG public key at wwwkeys.de.pgp.net
> 

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