User's Manual 302 Document #: LTRT-89730
Mediant 3000
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.
16.7.3.5 Location Based Emergency Routing
The device supports location-based emergency routing (E-911) in Lync Server. 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 304.
Note: Location-
based emergency routing is applicable only to the Gateway
application.
16.7.4 Configuring AudioCodes ELIN Device
This section describes E9-1-1 configuration of the AudioCodes ELIN Gateway deployed in
the Lync Server environment.
16.7.4.1 Enabling the E9-1-1 Feature
By default, the ELIN device feature for E9-1-1 emergency call handling in a Lync
environment is disabled.
To enable the ELIN feature for the SBC application:
Configure the 'SBC PSAP Mode' parameter to Enable for the IP Group through which
you want to communicate with the public-safety answering point (PSAP). For more
information on IP Groups, see ''Configuring IP Groups'' on page
343.
To enable the ELIN feature for the Gateway application:
1. Open the Advanced Parameters page (Configuration tab > VoIP menu > SIP
Definitions > Advanced Parameters).
2. From the 'E911 Gateway' drop-down list (E911Gateway), select NG911 Callback
Gateway.
16.7.4.2 Configuring the E9-1-1 Callback Timeout
The PSAP can use the ELIN to call back the E9-1-1 caller within a user-defined time
interval (in minutes) from when the initial call established with the PSAP has been
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