Microsoft Lync Server 2010 And E9-1-1 - AudioCodes Mediant 1000B User Manual

4. The E9-1-1 Selective Router determines the geographical location of the caller by
requesting this information from an Automatic Location Identification (ALI) database
based on the phone number or Automatic Number Identifier (ANI) of the 911 caller.
Exact location information is also supplied by the Master Street Address Guide
(MSAG) database, which is a companion database to the ALI database. Phone
companies and public safety agencies collaborate beforehand to create master maps
that match phone numbers, addresses and cross streets to their corresponding PSAP.
This MSAG is the official record of valid streets (with exact spelling), street number
ranges, and other address elements with which the service providers are required to
update their ALI databases.
5. The E9-1-1 Selective Router sends the call to the appropriate PSAP based on the
retrieved location information from the ALI.
6. The PSAP operator dispatches the relevant emergency services to the E9-1-1 caller.
26.11.4.2

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.
26.11.4.2.1 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 26-6: Microsoft Lync Server 2010 Client Acquiring Location Information
User's Manual
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