AudioCodes Mediant 500L MSBR User Manual

User's Manual 29. Configuring Supplementary Services
Version 6.8 469 Mediant 500L MSBR
29.11.4.4 Configuring AudioCodes ELIN Gateway
This section describes E9-1-1 configuration of the AudioCodes ELIN Gateway deployed in
the Lync Server 2010 environment.
29.11.4.4.1 Enabling the E9-1-1 Feature
By default, the E9-1-1 feature in the ELIN Gateway for Lync Server 2010 is disabled. To
enable it, the following ini file parameter setting must be done:
E911Gateway = 1
29.11.4.4.2 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
terminated. By default, an ELIN can be used for PSAP callback within 30 minutes after the
call is terminated. You can change this interval, by using the following ini file parameter:
E911CallbackTimeout = <time value> ; where <time value > can be
any value from 0 through 60
29.11.4.4.3 Configuring the SIP Release Cause Code for Failed E9-1-1 Calls
When a Lync 2010 client makes an emergency call, the call is routed through the Microsoft
Mediation Server to the ELIN Gateway, which sends it on to the PSTN. In some scenarios,
the call may not be established due to either the PSTN (for example, the destination is
busy or not found) or ELIN Gateway (for example, lack of resources or an internal error). In
such a scenario, the Mediation Server requires that the ELIN Gateway "reject" the call with
the SIP release cause code 503 "Service Unavailable" instead of the designated release
call. Such a release cause code enables the Mediation Server to issue a failover to another
entity (for example, another ELIN Gateway), instead of retrying the call or returning the
release call to the user.
To support this requirement, the ELIN Gateway can be configured to send the 503 "Service
Unavailable" release cause code instead of SIP 4xx if an emergency call cannot be
established. To enable this support, the following ini file parameter setting must be done:
Note: This can also be configured using the ini
file parameter,
EmergencySpecialReleaseCause.
 To enable SIP response 503 upon failed E911:
1. Open the Advanced Parameters page (Configuration tab > VoIP menu > SIP
Definitions > Advanced Parameters).
2. From the 'Emergency Special Release Cause' drop-down list, select Enable.

AudioCodes Mediant 500L MSBR Specifications

General

Brand	AudioCodes
Model	Mediant 500L MSBR
Category	Network Router
Language	English