Working With Dms-100 Switches; Configuring The Dtmf Transport Types - 3Com VCX V7122 User Manual

ISDNBehavior_x = 512
ISDNNFASInterfaceID_x = ID
Usually the Interface Identifier is included in the Q.931 Setup/Channel
Identification IE only on T1 trunks that do not 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 'ISDNBehavior_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
'ISDNBehavior_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 (see the note below)
InterfaceID #2 for a 24 B-channel T1 trunk
InterfaceID #3 for a 24 B-channel T1 trunk
Etc.
Note: In the current version, the VCX V7122 doesn't support the DMS-100 Backup trunk.
Therefore, InterfaceID #1, should not be used.
For example, if four T1 trunks on a VCX V7122 are configured as a single NFAS group, that
is used with a DMS-100 switch, the following parameters should be used:
ISDNNFASInterfaceID_0 = 0
ISDNNFASInterfaceID_1 = 2
ISDNNFASInterfaceID_2 = 3
ISDNNFASInterfaceID_3 = 4
NFASGroupNumber_0 = 1
NFASGroupNumber_1 = 1
NFASGroupNumber_2 = 1
NFASGroupNumber_3 = 1
DchConfig_0 = 0 ;Primary T1 trunk
DchConfig_2 = 2 ;24 B-channel NFAS trunk
DchConfig_3 = 2 ;24 B-channel NFAS trunk
DchConfig_4 = 2 ;24 B-channel NFAS trunk

Configuring the DTMF Transport Types

You can control the way DTMF digits are transported over the IP network to the remote
endpoint. The following five modes are supported:
Using INFO message according to the Nortel IETF draft:
In this mode DTMF digits are carried to the remote side within INFO messages.
To enable this mode set:
'Enable DTMF = Yes' (IsDTMFUsed = 1)
146
(x = 0–7 identifying the VCX V7122 physical trunk)
(x = 0 to 255)
3Com VCX V7122 SIP VoIP Gateway User Manual