Passing Location Information To The Pstn Emergency Provider - AudioCodes Mediant 800B User Manual

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If you do not populate the location database, and the Skype for Business location policy, Location

Required is set to Yes or Disclaimer, the user will be prompted to enter a location manually.

15.8.2.3 Passing Location Information to the PSTN Emergency Provider

When a Skype for Business client, enabled for E9-1-1 emergency services, dials 9-1-1, the

location data and callback information stored on the client is sent with the call through the

Mediation Server to a SIP Trunk-based or PSTN-based emergency service provider. The

emergency service provider then routes the call to the nearest and most appropriate PSAP based

on the location information contained within the call.

Skype for Business passes the location information of the Skype for Business client in an IETF-

standard format - Presence Information Data Format - Location Object (PIDF-LO)–in a SIP

INVITE message. However, this content cannot be sent on the SIP Trunk or PSTN network since

they do no support such a content. To overcome this, Enterprises deploying the device can divide

their office space into Emergency Response Locations (ERLs) and assign a dedicated

Emergency Location Identification Number (ELIN) to each ERL (or zone). When Skype for

Business sends a SIP INVITE message with the PIDF-LO to the device, it can parse the content

and translate the calling number to an appropriate ELIN. The device then sends the call to the

SIP Trunk or PSTN with the ELIN number as the calling number. The ELIN number is sent to the

emergency service provider, which sends it on to the appropriate PSAP according to the ELIN

address match in the ALI database lookup.

The ERL defines a specific location at a street address, for example, the floor number of the

building at that address. The geographical size of an ERL is according to local or national

regulations (for example, less than 7000 square feet per ERL). Typically, you would have an ERL

for each floor of the building. The ELIN is used as the phone number for 911 callers within this

The figure below illustrates the use of ERLs and ELINs, with an E9-1-1 call from floor 2 at the

branch office:

The table below shows an example of designating ERLs to physical areas (floors) in a building

and associating each ERL with a unique ELIN.

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