3Com Nbx 100 And Ss3 Nbx Administration Guide

Overview of Virtual Tie Lines91
Conference CallsUsers can set up conference calls over VTLs in much the same way that 
they set up conference calls with other users at their local site, or at a site 
reachable by an external telephone line. On NBX 100 systems, you can 
have up to four 4-person conference calls simultaneously. On a 
SuperStack 3 NBX system, you can have up to twelve 4-person 
conference calls simultaneously.
To be able to make conference calls between sites, you must have IGMP 
(Internet...

92CHAPTER 2: DIAL PLAN
Conference Calls Involving Site Codes and Off-Site Telephones
In Figure 29
, you work in the Chicago office and want to establish a 
conference call with someone in Atlanta, someone in Dallas, and 
someone at an external telephone number, you:
1Dial the Atlanta site code (62) and then the extension.
2After the Atlanta user answers, press Conference and dial the Dallas site 
code (63) and then the extension.
3When the Dallas user answers, press Conference again to connect all 
three...

How to Configure a Virtual Tie Line93
Dial Plan
ConfigurationYou configure the dial plan after you install the VTL license. See “License 
Installation” earlier in this chapter for information about VTL licenses.
To configure the dial plan for VTLs, you must define:
■Routes within the dial plan
■Digit sequences to be used to select those routes
■Operations to be performed for each route
Example: Dial Plan with Site-Unique Extensions
In Figure 28
, each of the three sites uses a unique extension range. In...

94CHAPTER 2: DIAL PLAN
The first TableEntry Create command modifies entry 3 in Table 1. Entry 3 
watches for 4-digit sequences (Min = 4, Max = 4) beginning with 2 
(extensions 2000 through 2999) and specifies route 522 whenever a 
4-digit sequence falls within this range. Entry 4 watches for 4-digit 
sequences (Min = 4, Max = 4) beginning with 3 (extension 3000 through 
3999) and specifies route 523 whenever a 4-digit sequence falls within 
this range. Route numbers 522 and 523 are examples only. The...

How to Configure a Virtual Tie Line95
Figure 31   Sample Dial Plan Entries for Chicago Using Site Codes
The first TableEntry Create command creates entry 100 in Table 1. This 
assumes that the highest previous entry in Table 1 was 99 or lower. Entry 
100 watches for the 2-digit sequence 62 followed by a 4-digit extension 
and specifies route 522 whenever a user dials such a 6-digit (Min = 6 and 
Max = 6) sequence. Entry 101 watches for the 2-digit sequence 63 
followed by a 4-digit extension and...

96CHAPTER 2: DIAL PLAN
For each DestinationRoute, two DestinationRouteOperation Create 
commands perform two functions:
■The stripLead command removes the two digits (62 or 63) leaving the 
4-digit extension the user dialed.
■The prepend command adds the IP Address of the destination NBX 
system to the extension that the user dialed. In this example, the IP 
address for Atlanta is 192.169.25.100 and for Dallas, the IP address is 
192.168.35.100. In the dial plan, you must use an asterisk (*) instead 
of...

How to Configure a Virtual Tie Line97
Adding VTL Devices
to the Pretranslators
(Optional)If you optionally added a pretranslator to the dial plan to reformat the 
information on incoming calls, you must add the VTL devices to that 
pretranslator.
To add the VTL devices to the pretranslator:
1In the NBX NetSet - Main Menu window, click Dial Plan.
2Click the PreTranslators tab.
3In the scroll list, select VTL.
4Click the Devices Using button.
5In the Devices Using Pretranslator window, scroll down in the...

98CHAPTER 2: DIAL PLAN
■Remote Access Verification — Verify that each of the systems can 
access each other.
■Placing Telephone Calls — Verify that telephone calls can be made 
between all pairs of connected systems in both directions.
Local System Verification
On each system you must verify that you can view the VTLs using the NBX 
NetSet utility. To verify that you can view the local VTLs:
1In the NBX NetSet - Main Menu window, click Device Configuration.
2Click the Virtual Tie Lines tab.
3Verify that...

How to Configure a Virtual Tie Line99
verification is successful, the window displays the VTLs configured at the 
remote site.
Example: You have installed an NBX system in Chicago, Atlanta, and 
Dallas, and you have configured two VTL connections on each of the 
Chicago and Atlanta systems. The IP addresses of the three systems are:
■Chicago — 192.168.15.100
■Atlanta — 192.168.25.100
■Dallas — 192.168.35.100
If you perform the Query Remote operation from the Chicago system to 
the Atlanta system, the...

100CHAPTER 2: DIAL PLAN
If the local NBX system fails to access the remote system, an error 
message appears similar to the one shown in Figure 34
.
Figure 34   Query Remote Error Message
If you have not yet configured the remote system to support VTLs, this 
message indicates that you must do so before the Query Remote 
operation can succeed.
If you have configured the remote system to support VTLs, the error 
message indicates that the local NBX system cannot access the remote 
system using the IP...