Version 7.2 309 Mediant 800B Gateway & E-SBC
User's Manual 15. Services
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:
Figure 15-56: Microsoft Skype for Business 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 310.
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)
♦ Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED) chassis ID
and port ID
For a Skype for Business client that moves inside the corporate network such as a soft
phone on a laptop that connects wirelessly to the corporate network, Skype for Business can
determine which subnet the phone belongs to or which WAP / SSID is currently serving the
soft-client.
4. The LIS queries the published locations for a location and if a match is found, returns the
location information to the client. The matching order is as follows:
• WAP BSSID
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