[SIPForum-techwg] SIPconnect 1.1 baseline - IPv6

[Henning Schulzrinne]

I disagree. Having a standard in 2008 that does not mandate IPv6  
support is irresponsible.

On Aug 13, 2008, at 3:09 AM, Elwell, John wrote:

> The intention behind the mentioning of IPv6 needs to be clarified.  
> There
> are no normative statements regarding IPv6, although there is a
> statement in section 4 that says that the networks "can operate in
> either IPv4 or IPv6 modes". This has a number of consequences. Clearly
> an IPv4-only SP network will not interoperate with an IPv6-only
> enterprise network. Also an SP network or an enterprise network might
> not be wholly IPv4 or IPv6 (e.g., signalling is terminated on IPv6,
> media on IPv4, or vice versa). Interoperation is normally solved  
> either
> by dual stack devices or by interworking. Moreover, the choice of IP
> version also impacts signalling (e.g., in header fields such as Via  
> and
> in SDP). Negotiation of the version to be used for media needs to be
> accomplished using ICE or ICE-lite. To claim support for IPv6, all  
> these
> issues would need to be addressed. Again, with a view to lowering the
> bar for version 1.1, we should mandate IPv4 support. Optional IPv6
> support, perhaps based on dual-stack devices, could be a topic for a
> future version of the specification.
>
> John
>