@tlpeter
One last thing,
According to support site/96xx,
Avaya one-X® Deskphone H.323 6.2 Software for the 9608/9611G/9621G/9641G
The new 9600 Series IP Deskphones - the 9608, 9611G, 9621G and 9641G models - require Avaya one-X® Deskphone H.323 6.2 software.
Avaya one-X® Deskphone H.323 Release 6.2 is supported on the 9608, 9611G, 9621G and 9641G IP Deskphones only and when used with Avaya Aura® Communications Manager. It will not load or operate on any other models. It is also not supported at this time when these models are used with Avaya IP Office or Avaya Branch Gateway B5800. Support for Avaya IP Office and Avaya Branch Gateway B5800 is pending in the calendar second quarter of 2012.