Working With Dms-100 Switches - 3Com V7122 User Manual

The default value of the Interface ID is identical to the number of the physical T1 trunk (0 for
the first gateway trunk, 1 for the second gateway T1 trunk and the like up to 7).
To define an explicit Interface ID for a T1 trunk (that is different from the default), use the
following parameters:
ISDNIBehavior_x = 512
ISDNNFASInterfaceID_x = ID
•
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.

Working with DMS-100 Switches

The DMS-100 switch requires the following NFAS Interface ID definitions:
InterfaceID #0 for the Primary trunk
InterfaceID #1 for the Backup trunk
InterfaceID #2 for a 24 B-channel T1 trunk
InterfaceID #3 for a 24 B-channel T1 trunk
Etc.
For example, if four T1 trunks on a gateway are configured as a single NFAS group, with
Primary and Backup T1 trunks, that is used with a DMS-100 switch, the following parameters
should be used:
NFASGroupNumber_0 = 1
NFASGroupNumber_1 = 1
NFASGroupNumber_2 = 1
NFASGroupNumber_3 = 1
DchConfig_0 = 0
DchConfig_1 = 1
DchConfig_2 = 2
DchConfig_3 = 2
If there is no NFAS Backup trunk, the following configuration should be used:
ISDNNFASInterfaceID_0 = 0
ISDNNFASInterfaceID_1 = 2
ISDNNFASInterfaceID_2 = 3
ISDNNFASInterfaceID_3 = 4
ISDNIBehavior = 512
;ISDNNFASInterfaceID configuration above
NFASGroupNumber_0 = 1
292
(x = 0 to 7 identifying the gateway's physical trunk)
(x = 0 to 255)
;Primary T1 trunk
;Backup T1 trunk
;B-Channel NFAS trunk
;B-channel NFAS trunk
;This parameter should be added because of
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