This update package fixes the following issues that were not previously documented in a Microsoft Knowledge Base article:

• When you connect your IP phone through the Internet, the telephone call logs are not populated with received or dialed calls.
• When you block a contact, you cannot call that contact from the Contact List.
• After you apply the update package in KB 972398 to your IP phone, the telephone performance becomes slow. The response time of the dial pad also becomes slow.

KB Article:
http://support.microsoft.com/?kbid=977065

Download:
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=565595be-6cf3-4a61-a1e4-12555749ca64