User's Manual 340 Document #: LTRT-68822
Mediant 2000
26.5.2.2 Microsoft Lync Server 2010 and E9-1-1
Microsoft Lync Server 2010 enables Enterprise voice users to access its unified
communications platform from virtually anywhere and through many different devices. This,
together with a deployed MLTS, poses a challenge for E9-1-1 due to the difficulty in
accurately locating the E9-1-1 caller. However, Lync Server 2010 offers an innovative
solution to solving Enterprises E9-1-1 location problems.
26.5.2.2.1 Gathering Location Information of Lync 2010 Clients for 911 Calls
When a Microsoft® Lync™ 2010 client (hereafter referred to as Lync 2010 client) is
enabled for E9-1-1, the location data that is stored on the client is sent during an
emergency call. This stored location information is acquired automatically from the
Microsoft Location Information Server (LIS). The LIS stores the location of each network
element in the enterprise. Immediately after the Lync 2010 client registration process or
when the operating system detects a network connection change, each Lync 2010 client
submits a request to the LIS for a location. If the LIS is able to resolve a location address
for the client request, it returns the address in a location response. Each client then caches
this information. When the Lync 2010 client dials 9-1-1, this location information is then
included as part of the emergency call and used by the Emergency Services provider to
route the call to the correct PSAP.
The gathering of location information in the Lync Server 2010 network is illustrated in the
figure below:
Figure 26-3: Microsoft Lync Server 2010 Client Acquiring Location Information
1. The Administrator provisions the LIS database with the location of each network
element in the Enterprise. The location is a civic address, which can include
contextual in-building and company information. In other words, it associates a
specific network entity (for example, a WAP) with a physical location in the Enterprise
(for example, Floor 2, Wing A, and the Enterprise's street address). For more
information on populating the LIS database, see 'Adding ELINs to the Location
Information Server' on page 342.
2. The Administrator validates addresses with the Emergency Services provider's MSAG
–a companion database to the ALI database. This ensures that the civic address is
valid as an official address (e.g., correct address spelling).
3. The Lync 2010 client initiates a location request to the LIS under the following
circumstances:
• Immediately after startup and registering the user with Lync Server 2010
• Approximately every four hours after initial registration
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