Multilevel Precedence And Preemption - AudioCodes Mediant 500 E-SBC User Manual

The above example scenario is configured as follows:
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 IP-to-Tel Calls
(Configuration tab > VoIP menu > GW and IP to IP > Manipulations > Dest
Number IP->Tel), add the following two rules for manipulating the destination number
of incoming emergency calls, based on ELIN numbers:
Figure 26-5: Destination Number Manipulation Rules for Location-Based Emergency Routing
Index 0 manipulates the destination number for London emergency callers; Index 1
manipulates the destination number for Manchester emergency callers.
26.5.2.4.5 Viewing the ELIN Table
You can view the ELIN table of the ELIN Gateway:

Using the following CLI command:
# show voip gw e911
ELIN
------------------------------------------------------------
4257275678
4257275999
4257275615
4257275616
------------ Current Time: 22:12:40

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
another MLPP subscriber that belongs to the same domain, MLPP service can
preempt the existing call that the called MLPP subscriber is on for a higher-
precedence call. MLPP service availability does not apply across different domains.
MLPP is typically used in the military where, for example, high-ranking personnel can
preempt active calls during network stress scenarios such as a national emergency or
degraded network situations.
MLPP can be enabled for all calls, using the global parameter, CallPriorityMode, or for
specific calls using the Tel Profile parameter, CallPriorityMode.
User's Manual
Time Count Index Call From
22:11:52 0 2 4258359333
22:11:57 0 3 4258359444
22:12:03 0 0 4258359555
22:11:45 0 1 4258359777
424
Mediant 500 E-SBC
Document #: LTRT-10427