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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