AudioCodes Mediant 4000 SBC User Manual page 318

CHAPTER 16 Services
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
ELINs to the Location Information
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:
◆
◆
● Depends on network connectivity:
◆
◆
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
● LLDP switch / port
● LLDP switch
● Subnet
● MAC address
This logic ensures that for any client that is connected by a wireless connection, a match is first
attempted based on the hardware address of its connected access point. The logic is for the
match to be based on the most detailed location. The subnet generally provides the least detail.
If no match is found in the LIS for WAP BSSID, LLDP switch / port, LLDP switch, or subnet,
the LIS proxies the MAC address to an integrated Simple Network Management Protocol
(SNMP) scanning application. Using SNMP may benefit some organizations for the following
reasons:
● LLDP is not supported by Skype for Business so this provides a mechanism for soft
phones to acquire detailed location information.
● Installed Layer-2 switches may not support LLDP.
IPv4 subnet
Media Access Control (MAC) address
Wireless access point (WAP) Basic Service Set Identifier (BSSID)
Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED) chassis ID
and port ID
Server.
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Mediant 4000 SBC | User's Manual
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