Re: [v4tov6transition] Any Experience with Using Behave's Stateless NAT-PT for IMS-SIP VoIP Application...

Ahh, my apologies Fred for referring to the stateless-portion of the v6v4-xlate-23 draft as "NAT-PT". I see in conversation there is a strict distinction between the two.

Tks,

Len...  

-----Original Message-----
From: Fred Baker [mailto:fred@cisco.com] 
Sent: Wednesday, September 22, 2010 11:59 AM
To: Mosley, Leonard
Cc: behave@ietf.org; v4tov6transition@ietf.org; v6ops@ops.ietf.org
Subject: Re: [v4tov6transition] Any Experience with Using Behave's Stateless NAT-PT for IMS-SIP VoIP Application...

On Sep 22, 2010, at 7:23 AM, Mosley, Leonard wrote:

> Greetings Fred et al, I had a couple of inquiries concerning use of the Behave WG NAT-PT algorithms:
>  
> 1)      I was wondering what vendors currently are implementing the Behave WG's NAT-PT algorithms?

To my knowledge, behave isn't supporting NAT-PT...

> 2)      Has anyone had any experience testing or implementing the stateless algorithm for use cases involving IMS SIPv4 VoIP clients calling SIPv6 clients and vice versa.  Such use cases assume an architecture where there is a co-existence period in the network consisting of both "legacy" SIPv4 clients and "newer" SIPv6 (dual-stack and/or v6-only) clients. 

Xing Li can comment on whether SIP/IVI is in use in his network. I would expect that the biggest issue in SIP deployment is the use of native addressing in SDP, which is probably best handled by some form of gateway. This is of course true of any protocol that carries IP addresses in the application and expects them to be meaningful to a peer; SIP across an IPv4/IPv4 NAT similarly requires some form of proxy that can direct indicated traffic correctly.

> 3)      I'm curious about RTP performance under moderate to heavy call loads as well as NAT-PT interaction with IMS-ALG.  If anyone can share at a high-level that would be great.

NAT-PT hasn't been all that wonderful. That's why it was deprecated...

> Tks,
>  
> Len Mosley
> Time Warner Cable
> 
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