Windows 2008 R2 DHCPv6 server for Cisco IP Phones?

[ADB100]

Since someone has raised a question on IPv6 and Cisco IP Phones I assume people are now actually looking at this? I know IANA handed over the last /8 block a few weeks ago so its probably got to happen at some point.
Anyway according to this document on CCO:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/ipv6/netstruc.html

Like IPv4 DHCP you need to specify in the DHCP scope where the CUCM (TFTP) server is. No option 150 and it mentions Vendor ID 9 and suboption 1. Any idea how these get configured on a Windows 2008 R2 DHCPv6 server?
I have added a Vendor Class for Vendor ID 9 (no idea what the Binary/ASCII is supposed to be?) but can't add an Option 1 for this as options 0 - 76 and 81 are reserved?

Any pointers?

Andy

Looked all over but ca

 

[ADB100]

I have 'sniffed' the boot-up of a 7970 with the latest SCCP firmware - 9.1.1(SR1) - and it behaves differently than a Windows 7 PC with regards to DHCPv6. With Windows 7 the PC identifies itself with a Vendor Class (MSFT 5.0). The 7970 does not do this in its DHCPv6 Solicit (it does for the equivalent DHCPv4 Request where is sends a VCI of 'Cisco Systems, Inc. IP Phone CP-7970G'.

I think therefore there are still inconsistencies and incompatibilities with DHCPv6 - whether Microsoft doesn't adhere to the Standards with its Server or Cisco doesn't with the client in the IP Phones, or whether the standard is a bit 'grey'.
Anyway for the time being this doesn't work....

Andy