User's Manual 308 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
1. The VoIP user dials 9-1-1.
2. AudioCodes' ELIN device sends the call to the emergency service provider over the PSTN or
SIP Trunk (PSAP server).
3. The emergency service provider identifies the call is an emergency call and sends it to an
E9-1-1 Selective Router in the Emergency Services provider's network.
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.
15.8.2 Microsoft Skype for Business and E9-1-1
Microsoft Skype for Business 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, Skype for Business offers an innovative solution to solving
Enterprises E9-1-1 location problems.
15.8.2.1 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
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