AudioCodes E-SBC User Manual page 714

CHAPTER 28 Configuring Supplementary Services
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The Resource Priority value in the Resource-Priority SIP header can be any one of those listed in
the table below.
For digital interfaces: A default MLPP call Precedence Level (configured by the
SIPDefaultCallPriority parameter) is used if the incoming SIP INVITE or ISDN Setup message
contains an invalid priority or Precedence Level value respectively.
For each MLPP call priority level, the Multiple Differentiated Services Code Points (DSCP) can be
set to a value from 0 to 63.
Table 28-3: MLPP Call Priority Levels (Precedence) and DSCP Configuration Parameters
MLPP
Precedence
Level
0 (lowest)
2
4
6
8
9 (highest)
For digital interfaces:
The device automatically interworks the network identity digits (NI) in the ISDN Q.931 Precedence
Information Element (IE) to the network domain subfield of the INVITE's Resource-Priority header,
and vice versa. The SIP Resource-Priority header contains two fields, namespace and priority. The
namespace is subdivided into two subfields, network-domain and precedence-domain. Below is an
example of a Resource-Priority header whose network-domain subfield is "uc", r-priority field is
"priority" (2), and precedence-domain subfield is "000000":
Resource-Priority: uc-000000.2
For digital interfaces, MLPP is applicable only to PRI and BRI interfaces.
The device provides MLPP interworking between SIP and ISDN (both directions).
For Trunk Groups configured with call preemption, all must be configured to MLPP
[1] or all configured to Emergency [2]. In other words, you cannot set some trunks
to [1] and some to [2].
The global parameter must be set to the same value as that of the Tel Profile
parameter; otherwise, the Tel Profile parameter is not applied.
If you configure call preemption using the global parameter and a new Tel Profile is
subsequently added, the TelProfile_CallPriorityMode parameter automatically
acquires the same setting as well.
If required, you can exclude the "resource-priority" tag from the SIP Require header
in INVITE messages for Tel-to-IP calls when MLPP priority call handling is used.
This is configured using the RPRequired parameter.
For a complete list of the MLPP parameters, see
Parameters.
Precedence Level in Resource-
Priority SIP Header
routine
priority
immediate
flash
flash-override
flash-override-override
Mediant 1000 Gateway & E-SBC | User's Manual
MLPP and Emergency Call
MLPPRoutineRTPDSCP
MLPPPriorityRTPDSCP
MLPPImmediateRTPDSCP
MLPPFlashRTPDSCP
MLPPFlashOverRTPDSCP
MLPPFlashOverOverRTPDSCP
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DSCP Configuration
Parameter