Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1383

IP trunk service 

DEFINITY ECS allows you to route voice and real time fax calls over Internet 
Protocol (IP) networks such as private intranets, reducing long-distance charges 
and giving you added flexibility in routing traffic between sites. Both the origin 
and destination switches must have the DEFINITY Internet Protocol Trunk 
(DEFINITY ECS) application or Lucent’s Internet Telephony Server-Enterprise 
(ITS-E) Release 1.2. DEFINITY IP Trunk application consists of the following 
components:

■

The DEFINITY IP Trunk software, which routes telephone calls and faxes 
over your company’s intranet

■

Configuration Manager software, which lets you administer the operation 
and performance of DEFINITY ECS service 

Both the IP trunk software and Configuration Manager reside on the Windows NT 
server on the IP Trunk circuit pack.

For information about Internet Telephony Server-Enterprise, contact your Lucent 
representative.

DEFINITY IP Trunk application can be administered to provide service that 
emulates T1 and E1 digital service. Your users dial phone numbers exactly as they 
would for calls routed over conventional trunk groups, including the use of the 
Automatic Route Selection (ARS) feature access code (normally 9 in the U.S.).

Here’s how DEFINITY ECS and the DEFINITY IP Trunk application process a 
call:

Caller

Goes off hook and dials a number.

Origin switch

Collects digits, consults the routing table, and sends the 
dialed digits to the IP trunk application.

Origin IP 
trunk 
application

Detects the incoming call and receives the digits sent by the 
origin switch. Performs any local digit translations, 
determines the IP address of the destination IP trunk server 
and sends the call over the IP trunk group to that IP address.