CHAPTER16 Services
Mediant 1000 Gateway & E-SBC | User's Manual
Gathering Location Information of Skype for Business Clients for 911 Calls
When a Microsoft Skype for Business 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 Skype for Business client registration
process or when the operating system detects a network connection change, each Skype for
Business 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 Skype for Business 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 Skype for Business network is illustrated in the figure
below:
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.
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 Skype for Business client initiates a location request to the LIS under the following
circumstances:
● Immediately after startup and registering the user with Skype for Business
● Approximately every four hours after initial registration
● Whenever a network connection change is detected (such as roaming to a new WAP)
The Skype for Business 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)
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