Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1567 Trunks and Trunk Groups 
20
IP Trunks — Internet Protocol Trunks
IP trunks allow DEFINITY ECS to route voice calls and faxes over a local- or 
wide-area TCP/IP network. Use IP trunks to reduce long-distance charges by 
routing calls over the Internet or your intranet. 
NOTE:
The origin and destination switches must both have the special hardware and 
software needed to route telephone...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1568 Trunks and Trunk Groups 
20
receive one of these start dial signals, it can be administered to send digits after an 
administered interval. (This time-out interval is the amount of time that the 
originating switch waits before sending digits.)
Analog tie trunks
The number of tie trunks in a connection and the technology of any multiplex 
systems used in the facilities affect the maximum...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1569 Trunks and Trunk Groups 
20
Transmission and supervisory signaling
A trunk is named for its transmission characteristics. For example, trunks are 
always classified by the direction of the traffic they allow:
nOne-way incoming trunk — A local trunk that can be selected (seized) by 
the far-end connected switch.
nOne-way outgoing trunk — A trunk that can be seized by the local switch 
to...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1570 Trunks and Trunk Groups 
20
nStart-dial signal — The distant office’s acknowledgment that it is ready to 
accept dialing from the originating office.
Seizure signals
Ear & Mouth (E&M) supervision
E&M supervision is a symmetric signaling scheme used on private network 
trunks. DC voltage levels are sent over E&M leads, which are separate from the 
transmission path. E & M signals indicate...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1571 Trunks and Trunk Groups 
20
nLoop-start (LS) supervision — A supervisory signaling scheme used 
between a telephone and a switch in which the telephone or far-end office 
completes the current path formed by the trunk wires. The circuit provides 
one signaling state when it is open and another when it is closed. A third 
signaling state is achieved by changing the direction or magnitude...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1572 Trunks and Trunk Groups 
20
Types of address transmission
In addition to seizure and start dial signals, switches have to transmit the digits 
and characters for telephone numbers. This is called address transmission. Three 
types of signaling are available: 
nDial Pulse (DP) addressing — A method of signaling that consists of 
regular momentary interruptions of a direct or alternating...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1573 Voice Message Retrieval 
20
particular calling states, such as on-hook, off-hook, ringing, not ringing, and so 
on, by using A and B bit-timed signaling. A and B bits carry a 0 or 1 depending on 
the type of trunk, the near-end channel unit type, far-end channel type, the 
condition of the trunk (open loop, loop closure, reverse battery, and so on), and 
whether it is transmit or receive...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1574 Voice Message Retrieval 
20
Detailed description
Voice Message Retrieval is only used for the retrieval of messages. When a 
terminal is in Voice Message Retrieval mode, it cannot be used to make calls or 
access other features. Voice Message Retrieval can be used to retrieve your own 
messages or messages for another user. However, a different user’s messages can 
only be retrieved by a...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1575 Voice Message Retrieval 
20
If you do not have a TN725B speech-synthesizer board, non-display phone 
users cannot retrieve LWC messages sent via the LWC button on a phone.
nBridged Call Appearance
Voice Message Retrieval on a Bridged Call Appearance functions the same 
as if it were activated by the primary extension associated with the bridged 
call appearance.
nLeave Word Calling
Voice...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1576 Voice Messaging Systems 
20
Voice Messaging Systems
DEFINITY ECS supports several Lucent voice or multimedia messaging systems. 
These systems allow users to send, retrieve, store, and forward messages, as well 
as perform many other tasks associated with messages. In addition to supporting 
multiple AUDIX systems, DEFINITY can have multiple hunt groups associated 
with a single AUDIX...