Supporting Tty Callers - Avaya Communication Manager Administrator's Manual

Feature Reference

Supporting TTY Callers

Supervision, addressing, and alerting methods have been carried over to digital trunks, which use
basically the same signaling scheme as analog trunks when establishing a call. These schemes are
handled in a variety of ways to indicate 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, see DS1 Circuit Pack
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
See the Hardware Guide for Avaya Communication Manager 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.
See Managing Trunks
See DS1 trunk service
See ISDN service
trunks.
Supporting TTY Callers
Use the following tools in your Avaya Communication Manager system to support Teletypewriter device
(TTY) callers:
•
Announcements that play TTY recordings
•
Hunt groups set up specifically for TTY callers
•
Vectors that can process TTY callers as well as voice caller
Announcements for TTY Callers
You record announcements for Tele-typewriter device (TTY) callers in the same way as you record voice
announcements. However, instead of recording from the handset of your telephone, you record from a
TTY device. The device is attached to your phone either by using an acoustic coupler into which you
place the telephone handset or by plugging the TTY device directly into the back, if it is a digital phone.
After calling the announcement extension, and pressing 1 to record, you simply type the announcement
using the TTY device.
1746
on page 778 for trunk-related terms associated with DS1 trunk interfaces.
on page 349 for administration procedures.
on page 1514 for detailed information on Digital Signal Level 1 trunk service.
on page 1579 for detailed information about Integrated Services Digital Network
Administrator's Guide for Avaya Communication Manager
November 2003