AudioCodes Mediant 2000, User Manual

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Version 5.6 399 November 2008
SIP User's Manual 9. Advanced PSTN Configuration
The NFAS group is identified by an NFAS GroupID number (possible values are 1 to 9). To
assign a number of T1 trunks to the same NFAS group, use the
ini
file parameter
NFASGroupNumber_x = groupID (where
x
is the physical trunk ID (0 to the maximum
number of trunks) or the Web interface (refer to ''Configuring the Trunk Settings'' on page
82 ).
The parameter ‘DchConfig_x = Trunk_type’ defines the type of NFAS trunk. Trunk_type is
set to 0 for the primary trunk, to 1 for the backup trunk, and to 2 for an ordinary NFAS trunk.
‘x’ depicts the physical trunk ID (0 to the maximum number of trunks). You can also use the
Web interface (refer to ''Configuring the Trunk Settings'' on page
82 ).
For example, to assign the first four T1 trunks to NFAS group #1, in which trunk #0 is the
primary trunk and trunk #1 is the backup trunk, use the following configuration:
NFASGroupNumber 0 = 1
NFASGroupNumber_1 = 1
NFASGroupNumber_2 = 1
NFASGroupNumber_3 = 1
DchConfig_0 = 0
;Primary T1 trunk
DchConfig_1 = 1 ;Backup T1 trunk
DchConfig_2 = 2 ;24 B-channel NFAS trunk
DchConfig_3 = 2 ;24 B-channel NFAS trunk
The NFAS parameters are described in ''PSTN Parameters'' on page 303 .
9.4.1 NFAS Interface ID
Several ISDN switches require an additional configuration parameter per T1 trunk that is
called ‘Interface Identifier’. In NFAS T1 trunks, the Interface Identifier is sent explicitly in
Q.931 Setup / Channel Identification IE for all NFAS trunks, except for the B-channels of
the Primary trunk (refer to note below).
The Interface ID can be defined per member (T1 trunk) of the NFAS group, and must be
coordinated with the configuration of the Switch. The default value of the Interface ID is
identical to the number of the physical T1 trunk (0 for the first trunk, 1 for the second T1
trunk, and so on, up to the maximum number of trunks).
To define an explicit Interface ID for a T1 trunk (that is different from the default), use the
following parameters:
„ ISDNIBehavior_x = 512 (x = 0 to the maximum number of trunks identifying the
device's physical trunk)
„ ISDNNFASInterfaceID_x = ID (x = 0 to 255)
Notes:
•
Usually the Interface Identifier is included in the Q.931 Setup/Channel
Identification IE only on T1 trunks that doesn’t contain the D-channel.
Calls initiated on B-channels of the Primary T1 trunk, by default, don’t
contain the Interface Identifier. Setting the parameter ISDNIBehavior_x to
2048’ forces the inclusion of the Channel Identifier parameter also for the
Primary trunk.
•
The parameter ISDNNFASInterfaceID_x = ID can define the ‘Interface ID’
for any Primary T1 trunk, even if the T1 trunk is not a part of an NFAS
group. However, to include the Interface Identifier in Q.931
Setup/Channel Identification IE configure ISDNIBehavior_x = 2048 in the
ini
file.