You deploy Location Information Server (LIS) and Enhanced 9-1-1 (E9-1-1) in a Microsoft Lync Server 2010 environment.
You sign in to Lync 2010 by using a telephone that is running Lync 2010 Phone Edition.
The LIS information is retrieved successfully.
You use the telephone for several hours.
In this scenario, the telephone might lose the LIS information, and a yellow warning icon displays above the Menu soft-key button. Therefore, no location information is provided by LIS when a user calls E9-1-1.
Note You can retrieve the LIS information after you restart the telephone.
This issue occurs because the telephone cannot obtain a new web ticket from the Web Ticket service when the current web ticket expires.
To resolve this issue, install the following cumulative update:
2577593 Description of the cumulative update for Microsoft Lync 2010 Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540: July 2011
For Polycom CX500, Polycom CX600 and Polycom CX3000 telephones:
2577594 Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000: July 2011
For Aastra 6721ip and Aastra 6725ip telephones:
2577595 Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: July 2011
For more information about E9-1-1 support in Lync Server 2010, visit the following Microsoft website: