RE: 3gpp transition solutions, revision -02

[<juha.wiljakka@nokia.com>]

 Hi, Luc!

1) As 3GPP specification TS 23.221 v.5.5.0 says:

"The UMTS/GSM architecture shall support IPv4 / IPv6 based on the statements below.
- IP transport between network elements of the IP Connectivity services (between RNC, SGSN and GGSN) and IP transport for the CS Domain: both IPv4 / IPv6 are options for IP Connectivity
-IM CN subsystem elements (UE to CSCF and the other elements e.g. MRF):
	- The architecture shall make optimum use of IPv6.
	- The IM CN subsystem shall exclusively support IPv6.
	- The UE shall exclusively support IPv6 for the connection to services provided by the IM CN subsystem.
..."

=> IMS *is* IPv6-only for both UE - CSCF and IMS internal interfaces. Yep, the text is just an "if" statement and in my opinion could be removed from the solutions doc.

2)

Well, can you suggest something? As Hesham pointed out, there should be a standardized solution to be proposed to the 3GPP. I would like also to remind that our design team aims not to specify new transition mechanisms or propose changes to 3GPP specs. We just make a "gap analysis" on the exisiting transition tools and their usability in 3GPP environment. And we will report our findings to the v6ops wg.

NAT-PT does have issues, the issues pointed out in section 3.4 are relevant in chapter 4 as well. The issues discussed in v6ops Interim meeting can be found in "3GPP breakout report"
http://www.6bone.net/v6ops/minutes/default.htm 

BR,
	-Juha-

-----Original Message-----
From: ext BELOEIL Luc FTRD/DMI/CAE
[mailto:luc.beloeil@rd.francetelecom.com]

1- You'll find me boring but I'd prefer not to see in section 4.2 that a S-CSCF could be dual-stack. To my mind that would mean that IMS would not be IPv6-only anymore?! 

ref. section 4.2
"If the S-CSCF is dual stack capable, the ALG 
    specific functions can be done in the S-CSCF directly, i.e. 
    changing the SIP message headers, and the SDP payload. "

2- I'm till ill at ease will the fact that NAT-PT is till the only solution mentioned even if that solution is none to be not enough efficient. Is IETF allowed to propose 3GPP other solutions ? How to do that ?

> -----Message d'origine-----
> De : juha.wiljakka@nokia.com [mailto:juha.wiljakka@nokia.com]
> Envoyé : mardi 5 novembre 2002 12:03
> À : v6ops@ops.ietf.org
> Objet : 3gpp transition solutions, revision -02
> 
> 
> 
>  Hi all,
> 
> a new version of the 3GPP (cellular) network design team 
> solutions draft is available here:
> 
> http://www.ietf.org/internet-drafts/draft-wiljakka-3gpp-ipv6-t
> ransition-02.txt
> 
> All comments are appreciated a lot.
> 
> Cheers,
> 	-Juha W.-
> 
> 
>