Line - AT&T MERLIN LEGEND Release 4.0 Feature Reference

Feature Reference
Terminology
Lines/Trunks
In this section on BRI, lines are the representations that appear on extension
sets or are put into pools. Trunks are the facilities that link switches. For all
trunks except DS1 (T1 or PRI) and BRI, internal line numbers have a one-to-one
correspondence to trunk ports. Since there are 2 transmission channels, or
bearer channels (called B-channels) for each BRI connection, two internal line
numbers are assigned for each BRI port. B-channels are present for each
Digital Subscriber Line (DSL); therefore 16 internal lines are assigned for each
module used.
A B-channel is used to carry user information, such as the voice or data content
of a call, between the system and the far-end switch.
Multiline Hunt Group
A multiline hunt group can be programmed at the central office to send calls to
a number of separate Directory Numbers (DNs) that are grouped together.
A multiline hunt group consists of a group of BRI lines with one main telephone
number (Directory Number). When this number is dialed by an outside caller, an
incoming call is attempted to one of the BRI lines in the hunt group. If the BRI
line is busy, the central office attempts to complete the call to the next available
idle line.
The type of switch used by the central office must be known in order to know the
available options of Multiline Hunt Group and to set it up correctly.
For the different switches, Multiline Hunt Group has the following capabilities:
5ESS . Multiline Hunt is available for voice-only and digital-data-only
applications. Multiline Hunt capability is provided under a switch feature
called "Series Completion." Do not use the 5ESS feature named Multiline
Hunt Group. For alternate voice and digital data applications, special CO
features, for example, Call Forwarding, are also required in the line
provisioning. As a result, this configuration may not be supported by
some of the RBOCs.
DMS-100. Multiline Hunt is available for voice-only, digital-data-only, and
alternate voice and digital data applications.
EWSD. Multiline Hunt capability is provided under a switch feature called
"Series Completion." However, it is limited to 6 DSLs in a group, and may
not be supported by some central offices. Do not use the EWSD feature
named Multiline Hunt Group. Multiline Hunt is available for voice-only and
digital-data-only applications. Alternate voice and digital data
applications are not supported.
Basic Rate Interface (BRI)
83