AudioCodes E-SBC User Manual page 715

CHAPTER 28 Configuring Supplementary Services
The MLPP Q.931 Setup message contains the Precedence IE. The NI digits are presented by four
nibbles found in octets 5 and 6. The device checks the NI digits according to the translation table of
the Department of Defense (DoD) Unified Capabilities (UC) Requirements (UCR 2008, Changes 3)
document, as shown below:
Level IE
0000
0001
0002
0003
●
●
●
By default, the device maps the received Resource-Priority field of the SIP Resource-Priority
header to the outgoing ISDN Precedence Level (priority level) field as follows:
■ If the network-domain field in the Resource-Priority header is "uc", then the device sets the
Precedence Level field in the ISDN Precedence Level IE according to Table 5.3.2.12-4
(Mapping of RPH r-priority Field to ISDN Precedence Level Value):
Table 28-5: Mapping of SIP Resource-Priority Header to ISDN Precedence Level for MLPP
MLPP Precedence Level
Routine
Priority
Immediate
Flash
Flash Override
■ If the network-domain field in the Resource-Priority header is any value other than "uc", then
the device sets the Precedence Level field to "0 1 0 0" (i.e., "routine").
This can be modified using the EnableIp2TelInterworkingtable field of the ini file parameter,
ResourcePriorityNetworkDomains.
Table 28-4: NI Digits in ISDN Precedence
Network Domain in SIP Resource-Priority Header
If the received ISDN message contains NI digits that are not listed in the
translation table, the device sets the network-domain to "uc" in the outgoing SIP
message.
If the received SIP message contains a network-domain value that is not listed in
the translation table, the device sets the NI digits to "0000" in the outgoing ISDN
message.
If the received ISDN message does not contain a Precedence IE, you can
configure the namespace value - dsn (default), dod, drsn, uc, or cuc - in the SIP
Resource-Priority header of the outgoing INVITE message. This is done using the
MLPPDefaultNamespace parameter. You can also configure up to 32 user-defined
namespaces, using the table ini file parameter, ResourcePriorityNetworkDomains.
Once defined, you need to set the MLPPDefaultNamespace parameter value to the
desired table row index.
ISDN Precedence Level
Mediant 1000 Gateway & E-SBC | User's Manual
uc
cuc
dod
nato
SIP Resource-Priority Header
4
3
2
1
0
- 677 -
Field
0
2
4
6
8