AT&T MERLIN LEGEND Release 4.0 Feature Reference page 387

Feature Reference
has a talk path with the caller. Privacy should be used to eliminate competition
for the same call.
When an individual personal line is assigned to a line button on more than one
telephone, a maximum of three users of that personal line can participate in an
in-progress call (including conference calls) on which Privacy has not been
activated. Users select the personal line button with the call.
Personal lines can be assigned through system programming to single-line
telephones or any other type of tip/ring device to allow the user to receive
outside calls. Normally the Ringing/Idle Line Preference for single-line
telephones or other tip/ring devices is activated and Automatic Line Selection
(ALS) is set to select an SA or ICOM button. With this arrangement in Key and
Behind Switch modes, the single-line telephone user can select the personal
line to make an outside call by dialing the Idle Line Access code (usually
while listening to inside dial tone.
In Hybrid/PBX mode, when Ringing/Idle Line Preference is deactivated or the
ALS is set to select an SA button, the single-line user cannot select the personal
line to make calls but can receive calls on the personal line.
For single-line telephones or other tip/ring devices in any mode of operation, the
ALS can be set to select the personal line. However, the user cannot make
inside calls or activate system features with this arrangement.
A multiline telephone user can program personal line buttons for Immediate
Ring, Delay Ring, or No Ring. When a personal line button is programmed for
No Ring, the user can still answer calls received on a personal line by pressing
the personal line button with the flashing green LED. However, when a personal
line is set to No Ring and Individual and/or Group Coverage is programmed for
the user, calls received on the personal line are not sent to coverage.
Considerations and Constraints
DID trunks should not be used as personal lines. If a DID trunk is assigned as a
personal line, and a call received on the DID trunk is ringing at the extension
programmed to receive the calls (the routing extension), the call can be
answered by using the personal line button. However, this is not recommended,
because the purpose of DID trunks is to route calls to specific extensions
without the need for personal line assignment or system operator assistance.
If a trunk is not assigned as a personal line, grouped in a pool (Hybrid/PBX
only), or assigned to ring into the Queued Call Console (QCC) queue, and a call
is received on the trunk, the caller hears ringback even if that trunk does not
terminate anywhere in the system.
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Personal Lines