Symptoms
Consider the following scenario:
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You deploy Location Information Server (LIS) and Enhanced 9-1-1 (E9-1-1) in a Microsoft Lync Server 2010 environment.
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You sign in to Lync 2010 by using a telephone that is running Lync 2010 Phone Edition.
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The LIS information is retrieved successfully.
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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.
Cause
This issue occurs because the telephone cannot obtain a new web ticket from the Web Ticket service when the current web ticket expires.
Resolution
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
More Information
For more information about E9-1-1 support in Lync Server 2010, visit the following Microsoft website:
General information about E9-1-1 support in Lync Server 2010For more information about the Web Ticket service, visit the following Microsoft website:
