Mlpp Parameters - AudioCodes Mediant 3000 User Manual

SIP User's Manual

MLPP Parameters

A.12.5.8
The Multilevel Precedence and Preemption (MLPP) parameters are described in the table
below.
Parameter
Web/EMS: Call Priority Mode
[CallPriorityMode]
Web: MLPP Default Namespace
EMS: Default Name Space
[MLPPDefaultNamespace]
Web/EMS: Default Call Priority
[SIPDefaultCallPriority]
Version 6.4
Table A-49: MLPP Parameters
Enables priority calls handling.

[0] Disable = 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 Trunk 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:

Applicable to CAS, and ISDN interfaces.

For more information, see 'Pre-empting Existing Call for
E911 IP-to-Tel Call' on page 316.
Determines the namespace used for MLPP calls received from
the ISDN side and destined for the Application server. The
namespace value is not present in the Precedence IE of the PRI
Setup message. Therefore, the value is used in the Resource-
Priority header of the outgoing SIP INVITE request.

[1] DSN = DSN (default)

[2] DOD = DOD

[3] DRSN = DRSN

[5] UC = UC
Determines the default call priority for MLPP calls.

[0] 0 = ROUTINE (default)

[2] 2 = PRIORITY

[4] 4 = IMMEDIATE

[6] 6 = FLASH

[8] 8 = FLASH-OVERRIDE
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Description
November 2011