Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1573

Voice Message Retrieval 

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 signaling. In addition to the above, refer to 

‘‘DS1 

Circuit Pack’’ on page 599

 for trunk-related terms associated with DS1 trunk 

interfaces.

■

Brazil Block Collect Call

In both continuous and pulsed E&M signaling, Block Collect Call is not 
included.

■

Personal Central Office Line (PCOL)

PCOL trunks cannot use continuous, pulsed, or discontinuous E&M.

Refer to the DEFINITY ECS System Description for information on the types of 
circuit packs available and their capacities. This manual also lists the maximum 
number of trunks and trunk groups for each system configuration.

Refer to 

‘‘Managing trunks’’ on page 337

 for administration procedures.

Refer to 

‘‘DS1 Trunk Service’’ on page 1317

 for detailed information on Digital 

Signal Level 1 trunk service.

Refer to 

‘‘IP trunk service’’ on page 1383

 for detailed information about sending 

voice calls over IP networks.

Refer to 

‘‘ISDN service’’ on page 1394

 for detailed information about Integrated 

Services Digital Network trunks.

Voice Message Retrieval allows attendants, phone users, and remote-access users 
to retrieve Leave Word Calling (LWC) and Call Coverage messages.