AT&T MERLIN LEGEND Release 4.0 Feature Reference page 249

Feature Reference
If the personal line is a loop-start trunk, it must provide a reliable
disconnect signal. A disconnect signal is the signal sent by the local
telephone company to notify the system that an outside caller has hung
up. Disconnect signaling is considered reliable when a disconnect signal
is sent on every call when the caller hangs up, and is considered
unreliable when a disconnect signal is not sent on every call. The factory
setting for loop-start trunks is Unreliable Disconnect; this setting can be
changed to Reliable Disconnect through system programming. Remote
Call Forward cannot be used to forward calls arriving on a trunk
programmed as unreliable.
NOTE:
Programming a loop-start trunk as reliable when in fact it does not provide
reliable disconnect signaling leaves the trunk in a permanent busy condition
after a call on that trunk has been forwarded to an outside number.
A forwarded call rings as shown in Table 20.
Table 20. Forwarded Call Ringing
Telephone Calls forwarded to
Type Inside Extension
Multiline Forwarding telephone rings once.
Green LED continues flashing (call
can still be answered). Receiving
telephone rings, and green LED
flashes at available SA or ICOM
button until call is answered.
Single-line Forwarding telephone rings until call
is answered. Destination telephone
rings, and green LED flashes at
available SA or ICOM button until
call is answered.
Delayed Call Forwarding
In Release 4.0 and later, each user can program a Forwarding Delay setting for
calls that are forwarded using Forward, Remote Call Forwarding, or Follow Me.
The Forwarding Delay is the number of rings that a call rings at the Forwarding
Extension before it is forwarded to the Forwarding Receiver. The number of
rings can be set from zero to nine (0-9 rings) through System Programming.
Once the Forwarding Delay is programmed, it is in effect until it is re-
programmed.
The user may use this feature to screen calls during that time by checking the
displayed calling number if it is available.
Outside Number
Forwarding telephone does not ring.
Destination telephone rings.
Forwarding telephone does not ring.
Destination telephone rings.
Forward and Follow Me
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