AT&T MERLIN LEGEND Release 4.0 Feature Reference page 168

Feature Reference
Conference
Coverage
Directories
Do Not Disturb
Forward and
Follow Me
Group Calling
Hold
Last Number Dial
Multi-Function
Module
168
Digital Data Calls
Conference does not function with data calls.
If using desktop video systems in passive bus configuration with an
MLX telephone, and the connected MLX telephone places a
Conference on hold, and a 2B data video connection is received by the
desktop video system, the Conference is not retrievable while the video
connection continues.
It is recommended not to use individual Coverage for 2B data calls.
Since a coverage receiver can only have one cover button per
coverage sender, covered 2B data calls are received only as 1B data
calls at the coverage receiver. The second call also continues to ring at
the coverage sender.
Secondary coverage delay does not apply to data calls. Calls ring
immediately.
Each desktop video system must have at least two group coverage
buttons for a coverage group to receive 2B Data video calls from a
coverage group. If there is only one Coverage button, covered 2B data
calls are received only as 1B data calls at the coverage receiver. The
second call also continues to ring at the coverage sender.
Terminal adapters and desktop video systems cannot make use of
Extension, Personal, or System Directories.
Terminal adapters can activate Do Not Disturb, by dialing the virtual
button number (for example
desktop video systems cannot activate Do Not Disturb because they
cannot dial a .
Terminal adapters can forward calls by dialing the associated feature
code. Internal calls can be answered either at the forwarding terminal
adapter or the destination terminal adapter. External calls however are
only answered by the forwarding terminal adapter.
desktop video systems cannot forward calls, since they cannot activate
features using feature codes.
Lines intended for data calls should not be mixed in the same Calling
Group with lines intended for voice calls.
Desktop video systems can only connect using 1B Data connections
when receiving a call through a Calling Group, since a Calling Group
only dispenses one call to each Calling Group member.
Data calls cannot be put on hold.
Terminal adapters can use Last Number Dial by dialing the Last
Number Dial feature code.
An MFM cannot be used with a terminal adapter or desktop video
system.
) of the Do Not Disturb button. Some