AT&T MERLIN LEGEND Release 4.0 Feature Reference page 104

Feature Reference
The module may be programmed through the MLX-20L or through the
PC-based System Programming and Maintenance (SPM) interface. It is stored
with other system information on the PCMCIA memory card. Beginning with
Releases following 3.0, this module is upgradable through the memory card.
(For information about system programming, see "Programming.")
NOTE:
Lines/trunks used for incoming Caller ID service should not have any equipment
other than the 800 GS/LS-ID module port connected to them.
LS-ID Delay Option
Caller ID information is sent from the central office during the first silent interval
of ringing. Since it is possible to answer a call before this information arrives,
you can turn on the LS-ID Delay option, which suppresses ringing until the
Caller ID information arrives. This option can be programmed for each trunk.
The factory setting is Off.
On telephones with personal lines, users see the green LED flash next to the
personal line button when a call arrives on the line. The red LED lights and the
telephone rings after a 6-second delay or when Caller ID information arrives,
whichever occurs first. Other telephones do not receive the call until after the 6-
second delay or Caller ID information arrives.
NOTE:
The caller may hear one or two extra bursts of ringback if LS-ID Delay is
programmed while the person receiving the call has not heard a ring yet.
When the option is programmed on a 2-way trunk, the system does not seize a
trunk from the pool for an outgoing call if that trunk is receiving an incoming call.
The differences between LS-ID Delay and Delay Ring are that Delay Ring
provides a fixed delay for all calls that arrive on the button programmed for
Delay Ring . LS-ID Delay affects calls that are received on lines connected to an
800 GS/LS-ID module. LS-ID Delay causes a variable delay in ringing at every
extension throughout the system on incoming calls to 800 GS/LS-ID modules.
The call is only delayed until Caller ID information is received from the central
office (on loop-start lines).
Facilities
The interface to Caller ID is provided by the 800 GS/LS-ID line/trunk module.
This module supports loop-start trunks and ground-start trunks but only
supports Caller ID on loop-start trunks.
NOTE:
Lines/trunks used for incoming Caller ID service should not have any equipment
other than the 800 GS/LS-ID module port connected to them.
104
Caller ID