Line Options - AT&T MERLIN LEGEND Key System Planning

Lines

Line Options

Loop-start Disconnect Reliability
See "Hold Disconnect" later in this
section.
Choose from the following options for the outside lines connected to the system
and record your decisions on Key System Form 2c, System Numbering —
Line Jacks:
Loop-Start Disconnect
Rotary Dial Lines
Toll Prefix Dialing Requirements (Toll Type)
Hold Disconnect
If the system includes any or all of the following additional line options,
mark the Outside Lines forms (3a, 3c, and 3D):
Remote Access
DS1 Facility
Tie Trunks
The disconnect signal is sent by the telephone company to the system when an
outside caller hangs up. Disconnect signals on incoming calls on loop-start lines
are classified as either reliable or unreliable. If reliable, on every call a
disconnect signal is sent to the system by the local telephone company shortly
after a caller hangs up. If unreliable, a disconnect signal is not sent by the local
telephone company on every call.
Since the disconnect signal on most loop-start lines is unreliable, the factory
setting for the disconnect signal is "unreliable."
Specifying that the disconnect signal for loop-start lines is reliable allows some
features to function better—for example, Remote Call Forward, remote call
transfers, and voice messaging systems such as MERLIN MAIL Voice
Messaging System.
Note: If the local telephone company uses a short Hold Disconnect interval, do
not specify a reliable disconnect signal.
Before you change the setting to reliable, check with your telephone company to
determine whether the disconnect signals for the loop-start lines are reliable and
to obtain the length of the Hold Disconnect interval.
Planning Form Instructions
At the top of Form 2c, under the "Loop-Start reliable Disconnect" heading,
do one of the following:
Check "No" if the loop-start lines have an unreliable disconnect signal.
Check "Yes" if the loop-start lines have a reliable disconnect signal.
Reliability
3-7
Line Options