AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 18

Release 4.0 Enhancements
Support for 2B Data applications
Release 4.0 has certified group and desktop video applications that use
two B-channels to make video/data calls from endpoints (stations) that
are enabled to use 2B Data. The endpoints that support these
applications connect to an MLX-port on the MERLIN LEGEND system. 2B
Data applications can make use of the NI-1 BRI, PRI, or T1 Switched 56
network interfaces to make outside connections using one or two data
channels at a time.
Support for T1 digital data transmission
Release 4.0 expands its T1 functionality by providing access to digital
data over the public switched 56 kbps network in addition to data Tie-
Trunk services. Users who have T1 facilities for voice services can now
use them for video calls at data rates of 56 kbps per channel (112 kbps
for video calls using two channels). The Release 4.0 T1 offering also
includes point-to-point connectivity over T1 Tie-trunks, allowing
customers to connect two MERLIN LEGEND Communications Systems or
a MERLIN LEGEND Communications System with a DEFINITY
Communications System. The two communications systems can be co-
located or off-premises.
Delayed Call Forwarding
Each user can program a Forwarding Delay setting for the Forward,
Remote Call Forwarding, or Follow Me features. The forwarding delay is
the number of times that a call rings at the forwarding extension before
the call is sent to the receiver. During the delay period, the user can
screen calls by checking the displayed calling number (if it is available).
The delay can be set at 0 to 9 rings. The factory setting for Forwarding
Delay is 0 rings (no delay).
Voice Announce on the QCC
The QCC operator can enable the fifth Call Button to announce a call on
another user's speakerphone if the destination telephone has a Voice
Announce capable SA button available. A QCC cannot receive Voice
Announce calls; they are received as ringing calls. The factory-set status
for the fifth Call Button is to have Voice Announce disabled.
Time-based option for overflow on Calling Group
Release 4.0 has added a time limit for calls in queue in addition to the
previous number limit. If the Overflow Threshold Time is set to a valid
number between 1–900 seconds, calls that remain in the Calling Group
Queue for the set time are sent to the Overflow Receiver. If the Overflow
Threshold Time is set to 0, Overflow by time is turned off. The factory-set
time limit is 0 seconds (Overflow by time off).
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System Planning