92 CHAPTER 2: DIAL PLAN
Successful VTL Call
If there are no network problems:
1The first line (Entry 1, OperId 1) removes the digits 72.
2The second line (Entry 1, OperId 2) prepends the IP address of the NBX
system at site B in front of the dialed extension number.
Unsuccessful VTL Call
If a network problem or a lack of VTL ports prevents the VTL call from
reaching its destination:
1The third line (Entry 2, OperId 1) removes the digits 72.
2The fourth line (Entry 2, OperId 2) prepends an appropriate dial string and
dials out over an analog telephone line.
Managing Existing Virtual Tie Lines
After VTLs are installed and you have verified that they are working
properly, you can manage them using the NBX NetSet utility. There are
NBX NetSet utility functions for:
■Modifying a Virtual Tie Line Name
■Viewing and Resetting Virtual Tie Line Statistics
■Enabling Audio Compression
■Enabling System-wide Silence Suppression
Modifying a Virtual
Tie Line Name
You can change the name of a VTL. The name appears in NBX NetSet
lists, and helps you identify each VTL.
To modify the name of a VTL:
1In the NBX NetSet - Main Menu window, click Device Configuration.
2Click the Virtual Tie Lines tab. The window that appears contains the list
of existing VTLs, and the status of each one.
3Select a VTL from the list.
4Click Modify. The Modify dialog box appears.
5In the New VTL name text box, type the name you want to assign to this
VTL. Click OK. Verify that the name change is on the Virtual Tie Lines tab.