MERLIN LEGEND Communications System Release 6.0
System Programming
555-660-111 Issue 1
February 1998
Programming Procedures
Page4-167PRI Facilities
4
The following rules apply to PRI tandem trunks in PBX or network mode:
■A single unused B-channel group number is automatically assigned to all
23 B-channels on the trunk; B-channels may be removed or added (for
more information, see “B-Channel Groups” on page 4–172).The group can
still exist, even if it includes no B-channels.
■PRI Dial Plan Routing does not apply for incoming calls on the trunk.
Incoming routing is automatically set to Route Directly to UDP for
B-channels in the automatically assigned group; this cannot be changed as
long as the Legend-PBX or Legend-NTWK switch type is in effect (see
“Incoming Routing” on page 4–188). However, local extensions need not
be included in the UDP Routing table.
■PRI outgoing tables do not apply to outgoing calls on the trunk.
■The system automatically assigns Electronic Tandem Network (ETN) as
the network service for the B-channel group that is automatically assigned
to the PRI tandem trunk; this setting cannot be changed a s long as the
switch type is in effect (see “Network Service” on page 4–178).
■The Copy Telephone Number to Send setting is set to Do Not Copy for the
PRI tandem trunk B-channel group; this setting cannot be changed as long
as the switch type is in effect (see “Copy Telephone Number to Send” on
page 4–185).

Summary: Switch Type 4

Programmable by System Manager
Mode Hybrid/PBX
Idle Condition Not required
Planning Form Form 3b, Incoming Trunks: DS1 Connectivity (100D module)
Factory Setting 4ESS
Valid Entries Not applicable
Inspect Yes
Copy Option No
Console Procedure → → →Dial slot no.→
→Specify switch type→ → →
PC Procedure → → →Type slot no.→ →
Specify switch type→→→