AT&T MERLIN LEGEND Release 4.0 Feature Reference page 429

Feature Reference
Group Calling. The MLX display of a calling group member shows the
original Called Party Number (before digit analysis). The same display
applies to PRI calls routed by dial plan to a group calling member
extension. Pressing the More button shows the Calling Party Number on
the second screen of the display.
Transfer Without Consultation. In Release 2.0 and later, pressing the
More button on an MLX display telephone that is a transfer destination
shows the original Called Party Number (before digit analysis). The same
display applies to transferred PRI calls routed by dial plan.
Outgoing Calls
Call-by-Call Service Selection is a feature for outgoing calls in Release 2.0 and
later; it allows a group of B-channels to carry a variety of supported PRI services
programmed in the Call-by-Call Services Table (see Table 33). The service
selected is based on the digits dialed and the bearer capability (voice, data, or
both) of the originating endpoint. In Releases 1.0 and 1.1, an outgoing call is
carried on a static B-channel, that is, a B-channel dedicated to one specific
service.
Outgoing calls can be made by accessing a personal line, a Pool, or Automatic
Route Selection (ARS). When a call is placed, the system determines whether
the line accessed is a PRI facility. If so, the system performs digit analysis with
the entries in the Network Selection Table (see Table 31) and the Special
Services Selection Table. The Network Selection table lists the prefixes for dial
access to alternative long distance carriers (for example, 10 xxx ), and the
Special Services Selection Table (see Table 32), lists prefixes that represent
special services, such as operator service or international dialing ( or
In addition, if the B-channel group for an outgoing call is programmed for
Call-by-Call Service Selection, the system performs digit analysis , with the
entries in the Call-by-Call Services Table (see Table 33). The entries in this table
indicate the service and tell the system how to delete digits and successfully
route an outgoing call.
A sample of each of these tables follows. Refer to System Programming for
information about programming these tables.
Network Selection Table
The Network Selection table lists the prefixes for dial access to alternative long
distance carriers (for example, 10 xxx ). If multiple entries in the Network
Selection Table match the dialed number, the one with the most non-wild card
digits prevails. If the first digits of a dialed number (on PRI) match any entry in
this table, the entry pattern is deleted from the dialed number, and the number
represented by the asterisks is used as the network selected. Characteristics
and valid entries for the Network Selection table are as follows:
There can be up to four entries (0 through 3).
The pattern can be up to eight digits.
Primary Rate Interface (PRI) and T1
).

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