Avaya has released UNIStim firmware 5.2 for their IP deskphones;
- 0621C8G for the 2007 IP deskphone
- 0623C8G, 0624C8G, 0625C8G, 0627C8G, 0626C8G for the 1110, 1120E, 1140E, 1150E and 1165E IP deskphones
- 062AC8G for the 1200 series IP deskphones
As always I recommend you review the release notes for all the details.