Instruction manual

MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Lines/Trunks
Page 3-11Selecting Line/Trunk Options
3
■ NI-1 BRI Connectivity
This section contains instructions for selecting line/trunk options for incoming
trunks. In addition, because some systems outside of the US have slow dial tones
from their local telephone companies, this section also includes instructions for
compensating for slow dial tone.
Forms Needed
■ Form 1, System Planning
■ Form 2c, System Numbering: Line/Trunk Jacks
■ Form 3a, Incoming Trunks: Remote Access
■ Form 3b, Incoming Trunks: DS1 Connectivity (100D Module)
■ Form 3c, Incoming Trunks: Tie
■ Form 3d, Incoming Trunks: DID
■ Form 3i, Incoming Trunks: BRI Options (800 NI-BRI module)
Loop-Start Reliable Disconnect 3
Disconnect signals on incoming calls on loop-start trunks are classified as one of
the following:
■ Reliable. A disconnect signal is sent to the system by the local telephone
company shortly after a caller hangs up. Loop-start trunks must be reliable
for remote call forwarding and trunk-to-trunk transfer. Also, reliable
disconnect is strongly recommended for remote call transfers, and VMSs
such as MERLIN MAIL VMS.
NOTE:
If the local telephone company uses a short hold disconnect interval,
do not specify a reliable disconnect signal. Also, to ensure proper
operation of AUDIX Voice Power, the system must have ground-start
or loop-start trunks with reliable disconnect.
■ Unreliable. A disconnect signal is not sent by the local telephone company
on every call.
!
SecurityAlert:
Toll fraud can occur when loop-start lines/trunks are used with unreliable
disconnect. If the calling party stays on the line after the called party hangs
up, the central office will return a dial tone at the conclusion of the call
enabling the caller to place another call as if it were being placed from your
company.
Since the disconnect signal on most loop-start trunks is unreliable, the factory
setting for the disconnect signal is Unreliable.