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Trunks
Trunk Options
Loop-Start Disconnect Reliability
See "Hold Disconnect" later in this
section.
Choose from the following options for the outside trunks connected to the
system and record your decisions on PBX System Form 2c, System
Numbering — Trunk Jacks:
Loop-Start Disconnect Reliability
Rotary Dial Trunks
Toll Prefix Dialing Requirements (Toll Type)
Hold Disconnect
QCC Operator Receiving Calls
QCC Queue Priority
If the system includes any or all of the following additional trunk options,
mark the Outside Trunks forms (3a, 3b, 3c, 3d, and 3e):
Remote Access
Pools
DS1 Facility
Tie Trunks
DID 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
trunks 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 trunks is unreliable, the factory
setting for the disconnect signal is "unreliable."
Specifying that the disconnect signal for loop-start trunks 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 trunks are reliable
and to obtain the length of the Hold Disconnect interval.
Trunk Options 3-7
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