Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1384

IP trunk service 

When DEFINITY IP Trunk application is installed and configured, it can receive 
calls from any IP address. You can restrict access to your site using Access 
Control on the Dial/Routing Plan property page of Configuration Manager. This 
allows you to specify the IP addresses (either specific or subnet) that can access 
your system through the DEFINITY IP Trunk application. This restriction on 
access can be enabled for other DEFINITY ECS systems (gateways) and 
NetMeeting™ PCs (clients).

The DEFINITY IP Trunk application can also block outgoing calls based on the 
analysis of the number dialed. For example, you can use Originating Routing Info 
on the Dial/Routing Plan property page of Configuration Manager to block all 
phone numbers that start with 1-900.

Normally, only calls going to a switch with a DEFINITY IP Trunk application are 
routed over IP networks. However, DEFINITY ECS supports off-premise dialing. 
Calls not intended for a remote switch can be routed over the IP network to that 
switch, which then routes the calls over the public telephone network to the final 
destination. This helps you significantly reduce long-distance costs.

For example, suppose there is a DEFINITY ECS with the DEFINITY IP Trunk 
application in Tokyo and another one in New York. A user can make a call to New 
Jersey from Tokyo by sending the call from Tokyo to New York over the IP 
network. The New York switch sends the call over the public telephone network to 
New Jersey, greatly reducing the long-distance expense.

If you want users to dial the same telephone numbers for off-premise dialing as 
for direct dialing, you have to administer the origin and destination switches to 
manipulate the digit string. For example, the following chart illustrates different 
possible originating and terminating locations for calls to a DEFINITY IP Trunk 
application site, labeled as Terminating Site-1.

Destination IP 
trunk 
application

Receives a connection indication and the digits sent by the 
origin IP trunk application. Performs any local digit 
translations and delivers the call to the destination switch.

Destination 
switch

Detects the incoming call and receives digits. Rings the 
phone associated with that number.

Called party

Answers the call.