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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
System Components
Page 3-8Control Unit
3
In addition, PRI and T1 support Group IV (G4) fax machines as well as desktop
and group videoconferencing.
PRI and T1 differ in some important ways:
■ Primary Rate Interface (PRI). PRI supports Integrated Services Access,
also called
Shared Access for Switched Services (SASS)
and
Call-by-Call
Service Selection
. This feature, available from various telecommunications
companies, allows multiple PRI services to use the same facilities,
eliminating the need to have dedicated, separate incoming and outgoing
B-channel groups. It selects the optimal service for each outgoing call,
allowing more than one service over each B-channel, including digital data
communications at speeds up to 64 kilobits per second.
NOTES:
1. In releases prior to 4.2, only AT&T services for Lucent
Technologies generic 4ESS, Lucent Technologies 5ESS, and
other providers’ emulations of these services are supported.
Release 4.2 and later systems support services on NORTEL
DMS-100 generic BCS 36 serving local exchange carriers,
NORTEL DMS-250 generic MCI07 serving the MCI network, and
Digital Switch Corporation DEX 600E generic 500-39.30 serving
the MCI network.
2. For the DMS-100 or DMS-250 switch type, you must give special
instructions to the service provider to use variant NTNAPRI
(Northern Telecom North America Primary Rate Interface)
instead of the AT&T protocol. For the DEX600E switch type,
instruct the service provider to use the profile p250. For
additional information, refer to
System Planning
or contact your
Lucent Technologies representative.
PRI supports
routing by dial plan
for DID-like call-handling. This is
especially appropriate for Caller ID services such as AT&T’s Station
Identification/Automatic Number Identification or the AT&T and MCI Dialed
Number Identification Service (DNIS) when your company subscribes.
DNIS routes incoming 800 or 900 calls according to customer-selected
parameters, such as area code, state, or time of call. For example, a
customer can specify that calls received from a particular area code be
routed to a specific individual or group responsible for accounts in the area.
The system’s PRI platform allows you to choose any combination of the
telecommunications company services listed below (your company must
subscribe to these).