User's Manual 294 Document #: LTRT-89730
Mediant 3000
Immediately after the Lync client registration process or when the operating system detects
a network connection change, each Lync 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 client dials
9-1-1, this location information is then included as part of the emergency call and used by
the emergency service provider to route the call to the correct PSAP.
The gathering of location information in the Lync Server network is illustrated in the figure
below:
Figure 16-31: 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 295.
2. The Administrator validates addresses with the emergency service 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 client initiates a location request to the LIS under the following
circumstances:
• Immediately after startup and registering the user with Lync Server
• Approximately every four hours after initial registration
• Whenever a network connection change is detected (such as roaming to a new
WAP)
The Lync client includes in its location request the following known network
connectivity information:
• Always included:
♦ IPv4 subnet
♦ Media Access Control (MAC) address
• Depends on network connectivity:
♦ Wireless access point (WAP) Basic Service Set Identifier (BSSID)
♦ Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED)
chassis ID and port ID
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