Version 6.6 343 Mediant 2000
User's Manual 26. Configuring Supplementary Services
Gateway then sends the call to the PSTN with the ELIN number as the calling number.
This ELIN number is sent to the Emergency Services 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:
Figure 26-4: Implementing ERLs and ELINs for E9-1-1 in Lync Server 2010
The table below shows an example of designating ERLs to physical areas (floors) in a
building and associating each ERL with a unique ELIN.
Designating ERLs and Assigning to ELINs
ERL Number Physical Area IP Address ELIN
1 Floor 1 10.13.124.xxx 503 972-4410
2 Floor 2 10.15.xxx.xxx 503 972-4411
3 Floor 3 10.18.xxx.xxx 503 972-4412
In the table above, a unique IP subnet is associated per ERL. This is useful if you
implement different subnets between floors. Therefore, IP phones, for example, on a
specific floor are in the same subnet and therefore, use the same ELIN when dialing 9-1-1.
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