Version 6.6 349 Mediant 2000
User's Manual 26. Configuring Supplementary Services
Note: This can also be configured using the ini
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.
26.5.2.4.4 Configuring Location-Based Emergency Routing
The device identifies callers by their ELIN numbers contained in the PIDF-LO XML body of
the received SIP INVITE message. To configure the manipulation rule for location-based
emergency routing, the ELIN number is used as the source prefix in the Destination Phone
Number Manipulation Table for Tel -> IP Calls table. To identify this source prefix as an E-
911 ELIN number, the "ELIN" string is added in front of the source prefix number, for
example, "ELIN1234567890". For example, assume an E-9-1-1 call is received for
destination 911@company.com and the ELIN number is 1234567890; to create the new
destination as 15509115000@company.com, the destination number is manipulated using
the manipulation table by adding prefix 1550 and suffix 5000.
To configure location-based emergency routing:
1. Enable location-based emergency routing, by loading an ini file to the device with the
following parameter setting:
E911Gateway = 2
2. In the Destination Phone Number Manipulation Table for Tel -> IP Calls table
(Configuration tab > VoIP menu > GW and IP to IP submenu > Manipulations >
Dest Number Tel->IP), configure the following fields:
• Under the Rule tab:
♦ 'Source Prefix': ELIN<ELIN source number>
• Under the Action tab:
♦ Configure the manipulation action as required
26.5.2.4.5 Viewing the ELIN Table
You can view the ELIN table of the ELIN Gateway.
Using Syslog, by invoking the following Web command shell:
SIP / GateWay / E911Dump
26.6 Multilevel Precedence and Preemption
The device supports Multilevel Precedence and Preemption (MLPP) service. MLPP is a
call priority scheme, which does the following:
Assigns a precedence level (priority level) to specific phone calls or messages.
Allows higher priority calls (precedence call) and messages to preempt lower priority
calls and messages (i.e., terminates existing lower priority calls) that are recognized
within a user-defined domain (MLPP domain ID). The domain specifies the collection
of devices and resources that are associated with an MLPP subscriber. When an
MLPP subscriber that belongs to a particular domain places a precedence call to
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