Version 7.2 285 Mediant 1000B Gateway & E-SBC
User's Manual 15. Services
The table below shows an example of designating ERLs to physical areas (floors) in a
building and associating each ERL with a unique ELIN.
Table 15-25: 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.
15.7.3 AudioCodes ELIN Device for Skype for Business E9-1-1 Calls to
PSTN
Microsoft Mediation Server sends the location information of the E9-1-1 caller in the XML-
based PIDF-LO body contained in the SIP INVITE message. However, this content cannot
be sent on the SIP Trunk or PSTN network since they do not support such content. To
solve this issue, Skype for Business requires a device (ELIN SBC or Gateway) to send the
E9-1-1 call to the SIP Trunk or PSTN. When Skype for Business sends the PIDF-LO to the
device, it parses the content and translates the calling number to an appropriate ELIN. This
ensures that the call is routed to an appropriate PSAP, based on ELIN-address match
lookup in the emergency service provider's ALI database.
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