3Com NBX 100 Administrator's Manual page 235

4 Repeat these steps to add additional groups, if desired, and then click OK.
Modifying an E1 Group
You may want to modify a digital line card group to change its name,
Auto Extension assignments, or other parameters. When you modify a
group, the changes affect all the Digital Line Cards assigned to that
group. To modify a digital line card group:
1 On the Digital Line Cards tab, select ISDN PRI Group List from the Select
Device Type drop-down list and click Apply.
2 Select the group that you want to modify.
3 Click Modify.
4 Make the changes that you want to the group parameters.
describes each parameter.
Table 47 Group Parameters
Parameter
Group Name
Trunk to Trunk
Auto Extension
5 Enable the On Line check box to bring the group on line.
The group does not come online unless the card and the span are online.
6 Click Apply to effect the changes.
7 Click OK.
Configuring and Managing E1 Digital Line Cards
E1 ISDN PRI Options
Enter a name to help you to identify this group in lists.
The Unrestricted setting enables and the Restricted setting
disables the transfer of incoming calls to another line card port.
For example, you could enable Trunk to Trunk transfers if you
plan to connect a Voice Over IP (VOIP) gateway to a line card
port, permit callers to use the system to access the telephone
system from a remote location, and use it to make CO calls.
Enter the Auto Extension number that you want to handle this
group for any of the Business Hours. Extension 500 is the Auto
Attendant.
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Table 47