AT&T MERLIN LEGEND Release 4.0 Feature Reference page 167

Feature Reference
Applications
The high speed data capabilities of the MERLIN LEGEND Communications
System can be used for a number of applications including desktop video
teleconferencing, and group video.
The desktop video system can be used to supply application sharing, video
collaboration, and high speed data/file transfer on either one or two data
channels at a time. If one channel is used the maximum data speed is 64 kbps
and if two channels are used the maximum data speed is 128 kbps.
Telephone Differences
Queued Call Consoles
Queued Call Consoles cannot be programmed for 2B Data. If a DLC is
programmed for 2B Data, the DLC cannot be changed to a QCC unless 2B Data
programming is first removed from the DLC.
Feature Interactions
Account Code Entry
Auto Dial
Automatic Route
Selection
Barge-In
Call Waiting
Callback
Camp-On
Since some desktop video systems do not support a # as the first digit
of a call, Account Code Entry cannot be entered for calls made by
these desktop video systems.
A terminal adapter can make a call using an auto dial button, by dialing
the virtual number of the auto dial button (for example #01).
Data calls can be made using ARS. Terminal adapters and desktop
video systems simply dial the ARS dial out code (usually 9) followed by
the telephone number to make calls using ARS. The data calls must be
routed through ARS pools that have only PRI, NI-1 BRI, and/or
Switched 56 T1 data lines.
Data calls cannot be barged into.
Call waiting does not work with data calls. The call appears to queue
but does not dequeue when the extension becomes available.
Desktop video systems can be programmed for autoqueuing using
Callback. As a line becomes available in the pool, or the busy desktop
video system becomes idle, the queued call is made one B-channel at
a time. When the second B-channel become available, it can be used
for the connection as well.
Although desktop video systems can use either on-hook or off-hook
queuing, you should only use off-hook queuing for 2B Data
connections. If you use on-hook queuing the call will be connected
using only one B-channel.
Camp-On does not function with data calls.
167
Digital Data Calls