AudioCodes Mediant 2000 User Manual page 525

SIP User's Manual
Parameter
Web: MLPP Default
Namespace
EMS: Default Name Space
[MLPPDefaultNamespace]
Web/EMS: Default Call
Priority
[SIPDefaultCallPriority]
Web: MLPP DiffServ
EMS: Diff Serv
[MLPPDiffserv]
Web/EMS: Preemption Tone
Duration
[PreemptionToneDuration]
Version 6.4
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 274.
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

[9] 9 = FLASH-OVERRIDE-OVERRIDE
If the incoming SIP INVITE request doesn't contain a valid priority
value in the SIP Resource-Priority header, the default value is used
in the Precedence IE (after translation to the relevant ISDN
Precedence value) of the outgoing PRI Setup message.
If the incoming PRI Setup message doesn't contain a valid
Precedence Level value, the default value is used in the Resource-
Priority header of the outgoing SIP INVITE request. In this scenario,
the character string is sent without translation to a numerical value.
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 and
outgoing MLPP calls with the Resource-Priority header.
The valid range is 0 to 63. The default value is 50.
Defines the duration (in seconds) in which the device plays a
preemption tone to the Tel and IP sides if a call is preempted.
The valid range is 0 to 60. The default is 3.
Note: If set to 0, no preemption tone is played.
525
A. Configuration Parameters Reference
Description
November 2011