SIP User's Manual 454 Document #: LTRT-65415
MediaPack Series
10.12.5.12 MLPP Parameters
The Multilevel Precedence and Preemption (MLPP) parameters are described in the table
below.
Table 10-51: MLPP Parameters
Parameter Description
Web/EMS: Call Priority Mode
[CallPriorityMode]
Enables priority call 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 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:
9 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".)
9 The incoming SIP INVITE message contains the
“emergency” value in the Priority header.
Notes:
9 Applicable to FXS/FXO interface.
9 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.
9 For a detailed description, see Pre-empting Existing Call
for E911 IP-to-Tel Call.
Web: MLPP DiffServ
EMS: Diff Serv
[MLPPDiffserv]
Defines the DiffServ value (differentiated services code
point/DSCP) used in IP packets containing SIP messages that
are related to MLPP calls. This parameter defines DiffServ for
incoming MLPP calls with the Resource-Priority header.
The valid range is 0 to 63. The default value is 50.
Notes:
The same value must be configured for this parameter and
the parameter PremiumServiceClassControlDiffServ.
Outgoing calls are tagged according to the parameter
PremiumServiceClassControlDiffServ.
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