AudioCodes Media Pack MP-11x, User Manual

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Version 6.6 597 MP-11x & MP-124
User's Manual 44. Configuration Parameters Reference
44.11.5.8 MLPP and Emergency Call Parameters
The Multilevel Precedence and Preemption (MLPP) and emergency E911 call parameters
are described in the table below.
Table 44-49: MLPP and Emergency E911 Call Parameters
Parameter Description
Web/EMS: Call Priority Mode
[CallPriorityMode]
Enables priority call handling for all calls.

[0] Disable (default).

[1] MLPP = MLPP Priority Call handling is enabled. MLPP
prioritizes call handling whereby the relative importance of
various kinds of communications is strictly defined, allowing
higher precedence communication at the expense of lower
precedence communications. Higher priority calls override
less priority calls when, for example, congestion occurs in a
network.

[2] Emergency = Preemption of IP-to-Tel E911 emergency
calls. If the device receives an E911 call and there are
unavailable channels to receive the call, the device
terminates one of the channel calls and sends the E911 call
to that channel. The preemption is done only on a channel
pertaining to the same Hunt Group for which the E911 call
was initially destined and if the channel select mode
(configured by the ChannelSelectMode parameter) is set to
other than “By Dest Number” (0). The preemption is done
only if the incoming IP-to-Tel call is identified as an
emergency call. The device identifies emergency calls by one
of the following:

The destination number of the IP call matches one of the
numbers defined by the EmergencyNumbers parameter.
(For E911, you must define this parameter with the value
"911".)

The incoming SIP INVITE message contains the
“emergency” value in the Priority header.
Notes:

This parameter is applicable to FXS/FXO.

For FXO interfaces, the preemption is done only on existing
IP-to-Tel calls. In other words, if all the current FXO channels
are busy with calls that were initiated by the FXO (i.e., Tel-to-
IP calls), new incoming emergency IP-to-Tel calls are
dropped.

MLPP and Emergency services can also be configured in a
Tel Profile.

For more information, see 'Pre-empting Existing Call for E911
IP-to-Tel Call' on page
292 .