Lucent Technologies 8.2

DEFINITY ECS Release 8.2

Administrator’s Guide

555-233-506 Issue 1

April 2000

Features and technical reference

1385IP trunk service

Possible sites for originating a call to Terminating Site-1 are labeled O1 (for

Originating Site-1), O2, and so on. A call can terminate on a telephone connected

to the switch at T1, or it can be routed “off-premise” to terminating sites T2, T3,

or T4. Since the IP calls received at T ermina ting Si te-1 are di aled t he same way a s

conventional calls, even if no off-premise dialing is configured, the telephone

number received will differ depending on where the call originated:

■Calls from Originating Site-O1 (which is within the same area code as T1)

contain only exchange and extension portions.

■Calls from O2 (which is within the same count ry, but in a different area

code than T1) contain a long distance access code and an area code, as well

as an exchange and an extension.

■Calls from O3 contain an international access code, a country code, a n area

code, an exchange and an extension.

In all three cases, the DEFINITY IP Trunk application at Terminating Site-1

changes the digits in the telephone number received to match what the switch

expects to receive for a call to one of its extensions.