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Issue 5, June 1999
terminal adapter and, instead, plug into the handset jack. These
systems may include a key that controls the functions of the
headset.)
Throughout Chapter 3. ALTERNATIVE CALL OPERATIONS, the
headset is included in instructions for handling calls. In addition,
Chapter
6.
HEADSET OPERATION is devoted exclusively to the
functions associated with the headset.
Types of Service Supported
Your Optiset terminal can support any of the following types of
service provided by your telephone operating company:
•
Basic ISDN terminal, with terminal-controlled call appearances
•
Multiline Hunt Group (MLHG) call appearance
•
Basic Electronic Key Telephone System (EKTS)
•
Call appearance call-handling (CACH)
Baaic ISDN Terminal
When the Optiset terminal is connected to a plain ISDN line, as
many line keys as desired can be programmed, up to the limit set
by the switching system. These line keys can have the same or
different directory numbers (DNs). You may make or receive any
number of calls up to the limit the switching system places on your
line, or up to the limit of 28 simultaneous calls that your Optiset
terminal can handle.
Multiline Hunt Group
Your Optiset terminal can be part of a Multiline Hunt Group, an
arrangement in which several phones are associated with the same
ON by the central office. An incoming call to the MLHG ON is
presented to the first available phone that is associated with the
MLHG line.
Basic Electronic Key Telephone Service
The Optiset terminal, programmed for Electronic Key Telephone
Service (EKTS), emulates the typical key telephone system used in
Issue 5, June 1999
many businesses. In such a system, mUltiple DNs are shared by
multiple phones; each phone can be used to make or answer calls
on any of the shared DNs. EKTS provides the additional features
of bridging into an active call of another user of the EKTS group,
and preventing other users from bridging into a call.
Call Appearance Call-Handling
Call appearance call-handling (CACH) is an extension of EKTS.
Each call appearance on the terminal is assigned a Call
Appearance 10 (CAID) that is used by the switching system to
determine the ON that is being used to place or receive a call.
For detailed information and instructions that apply to the eACH
EKTS operation, refer to Chapter 5. OPTISET TERMINAL USED
AS AN EKTS PHONE.
Additional Call Offering
When an incoming call is received by the Optiset terminal, it usually
has a channel 10 assigned by the switch to define which of the two
a-channels is used for the call.
However, if both B-channels
already are being used (either for connected calls or for ringing
calls), the switch sends the call with no channel 10. This is referred
to as an Additional Call Offering (ACO) call.
If the Optiset terminal is in Preview mode. pressing the line key
continuously will preview the active or alerting call, followed by the
longest waiting ACO call(s). in a cyclical fashion. If the terminal is
in Line Hold mode, pressing the line key will put the current call on
hold and answer the next call.
An ACO call cannot be answered if non-ACO calls are ringing and
have not been answered yet (an ISDN reqUirement).
If
the user
attempts to answer such an ACO call, the phone will beep. The
reason for the beep is that if the phone attempts to answer the ACO
call when non-ACO calls are still ringing, the ACO call will be
disconnected.
If
an ACO call is presented when the phone has a
connected call and no other calls are presented, the user can
answer the ACO call, which will cause the connected call to go on
hold.
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