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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1573Voice 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 signaling. In addition to the above, refer to ‘‘
DS1
Circuit Pack’’ on page 599 for trunk-related terms associated with DS1 trunk
interfaces.
Interactions
■ 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.
Related topics
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
Voice Message Retrieval allows attendants, phone users, and remote-access users
to retrieve Leave Word Calling (LWC) and Call Coverage messages.