CHAPTER16 Services
Mediant 1000 Gateway & E-SBC | User's Manual
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 16-28: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.
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 since they do not support such content. To solve this issue, Skype for
Business requires a (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 , 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.
The figure below illustrates an AudioCodes ELIN device deployed in the Skype for Business
environment for handling E9-1-1 calls between the company and the emergency service provider.
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