AudioCodes Mediant 800B User Manual page 301

User's Manual
Network Element
For the ELIN number to be included in the SIP INVITE (XML-based PIDF-LO message)
sent by the Mediation Server to the ELIN device, the administrator must add the ELIN
number to the <CompanyName> column (shown in the table above in bold typeface). As
the ELIN device supports up to five ELINs per PIDF-LO, the <CompanyName> column can
be populated with up to this number of ELINs, each separated by a semicolon. The digits of
each ELIN can be separated by hyphens (xxx-xxx-xxx) or they can be adjacent
(xxxxxxxxx).
When the ELIN device receives the SIP INVITE, it extracts the ELINs from the NAM field in
the PIDF-LO (e.g., <ca:NAM>1111-222-333; 1234567890 </ca:NAM>), which corresponds
to the <CompanyName> column of the LIS.
If you do not populate the location database, and the Lync Server location policy, Location
Required is set to Yes or Disclaimer, the user will be prompted to enter a location
manually.
15.9.2.3 Passing Location Information to the PSTN Emergency Provider
When a Lync 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.
Lync Server passes the location information of the Lync 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 using ISDN PRI
due to protocol limitations. 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 Lync
Server 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 ERL.
The figure below illustrates the use of ERLs and ELINs, with an E9-1-1 call from floor 2 at
the branch office:
Version 7.0
ostDirectional>,<City>,<State>,<PostalCode>,<Country>
Columns
301 Mediant 800B Gateway and E- SBC
15. Services