3Com VCX V7122 SIP User Manual page 68

VCX V7122/SIP E1/T1/J1 Configuration Parameters
Table 17
INI File Field Name
*
GUI Parameter Name
BchannelNegotiation
(Protocol Definition>B-Channel
Negotiation)
NFASGroupNumber_x
(Trunk Settings>NFAS Group
Number)
DchConfig_x
(Trunk Settings>D-Channel
Configuration)
68
Valid Range and Description
0 = Exclusive (default)
1 = Preferred
2 = Any
Applicable for ISDN protocols.
0 = Non NFAS trunk (default)
1 – 4 = NFAS group number
Indicates the NFAS group number for the selected trunk.
x identifies the Trunk ID (0-7).
Trunks that belong to the same NFAS group have the same number.
With ISDN Non-Facility Associated Signaling you can use single D-
channel to control multiple PRI interfaces.
Applicable only for T1 ISDN protocols.
The NFAS member of each trunk in NFAS group is equal to the
Trunk ID (0 – 7).
0 = Primary Trunk (default)
1 = Backup Trunk
2 = NFAS Trunk
D-channel configuration parameter defines primary, backup
(optional) and B-channels only trunks.
x identifies the Trunk ID (0-7).
Primary trunk contains D-channel that is used for signaling. Backup
trunk contains backup D-channel that is used if the primary D-
channel fails. The other NFAS trunks contain only 24 B-channels
without a signaling D-channel.
Applicable only for T1 ISDN protocols.
Backup trunk is not supported for DMS PRI variants.
3Com VCX V7122/SIP VoIP Gateway User Manual