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10 
Network Interfaces and Equipment
DEFINITY ProLogix Solutions Release 2 Overview 
555-235-100
Issue 2 June 1999 10-16
800-service trunks, which let your business pay the charges for inbound long-
distance calls so that callers can reach you toll-free
Direct Inward Dialing trunks, which connect DEFINITY ProLogix Solutions to 
the local central office for incoming calls dialed directly to stations without 
attendant assistance
Digital Service 1 trunks, which can be used to provide T1 or ISDN Primary Rate 
Interface service
Tie Trunks
Tie trunks carry communications between DEFINITY ProLogix Solutions and other 
switches in a private network. Several types of trunks can be used, depending on the 
type of private network you establish.
Auxiliary Trunks
Auxiliary trunks connect devices with the switch. Some of the features that are 
supported with this type of trunk are recorded announcements, telephone dictation 
service, malicious call trace, and loudspeaker paging.
Centralized 
Automatic Message 
Accounting (CAMA) 
and Enhanced 911 
Trunks
The Enhanced 911/Centralized Automatic Message Accounting (CAMA) trunk 
interface circuit pack enables DFEINTIY ProLogix Solutions to interface with 
Centralized Automatic Message Accounting trunks to provide Caller’s Emergency 
Service Identification (CESID) information to the local community’s Enhanced 911 
system through the local central office. With this feature, Enhanced 911 systems can 
see the extension number on the DEFINITY ProLogix Solutions system. This is 
required by some legislative and regulatory laws in certain states in the United States.