User's Manual 316 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
If all the ELINs in the list are in use by active calls, the device selects the ELIN number as
follows:
1. The ELIN with the lowest count (i.e., lowest number of active calls currently using this
ELIN).
2. If the count between ELINs is identical, the device selects the ELIN with the greatest
amount of time passed since the original E9-1-1 call using this ELIN was terminated
with the PSAP. For example, if E9-1-1 caller using ELIN 4257275678 was terminated at
11:01 and E9-1-1 caller using ELIN 4257275670 was terminated at 11:03, then the
device selects ELIN 4257275678.
In this scenario, multiple E9-1-1 calls are sent with the same ELIN.
15.8.3.5 Location Based Emergency Routing
The device supports location-based emergency routing (E-911) in Skype for Business. This
ensures that E-911 calls from remote branches are routed to emergency providers that are
relevant to the geographical area in which the remote branch callers are physically located.
To support this, the device enables routing and SIP header / number manipulation of such
emergency calls based on the geographical location of the caller. The device manipulates the
received destination number (i.e., 911) from the remote branch callers, into a destination number
of an emergency provider that is relevant to the geographical area in which the remote branch
office is located.
For an example on location-based emergency call routing, see 'Configuring Location-Based
Emergency Routing' on page 318.
Note: Location-based emergency routing is applicable only to the Gateway application.
15.8.4 Configuring AudioCodes ELIN Device
This section describes E9-1-1 configuration of the AudioCodes ELIN Gateway deployed in the
Skype for Business environment.
15.8.4.1 Enabling the E9-1-1 Feature
By default, the ELIN device feature for E9-1-1 emergency call handling in a Skype for Business
environment is disabled.
To enable ELIN feature for the SBC application:
For the IP Group through which you want to communicate with the public-safety answering
point (PSAP), configure the 'SBC PSAP Mode' parameter to Enable. For more information,
see Configuring IP Groups on page
365.
To enable ELIN feature for the Gateway application:
1. Open the Priority & Emergency page (Setup menu > Signaling & Media tab > SIP Definitions
folder > Priority and Emergency).
2. From the 'E911 Gateway' drop-down list (E911Gateway), select NG911 Callback Gateway.
Figure 15-57: Enabling ELIN E9-1-1 for Skype for Business
3. Click Apply.
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