Specifications

Using the telephones in a combination extension is fairly simple. The main thing
to understand is that the two telephones share a single extension in the same
way several home telephones share a single line. A system telephone works
like it always does and a standard telephone works like it always does when
connected to the system. Only one phone or device can be used at a time,
unless you want to join the two on a single call (the same way two people can
pick up the same call on different telephones at home). For example:
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Both phones share the same extension number.
Both phones share the same voice path; that is, when either phone is
busy, the extension is busy.
Calls ring at both phones.
A second call can ring at the system phone while the standard phone is
busy, but do not use the system phone to answer the second call until the
standard phone is idle or the first call will be disconnected.
If you make a voice-signaled intercom call to a combination extension
with a system phone, only the system phone signals.
Call Waiting (#316) does not work on a standard phone in combination
with a system phone.
The lights on the system phone show what the standard telephone is
doing as well as what the system phone is doing. For an explanation of
light patterns, see “Lights” at the beginning of this chapter.
If Privacy is active at a combination extension, no other extension can
join a call in progress at either a system phone or a standard device.
(However, a phone can interrupt a call on a standard device at the same
extension. For example, if a system phone and modem are combined at
an extension, picking up the handset of the system phone could interrupt
a modem transmission, even if Privacy is active.)
While on a call on a standard phone, you can use the system phone’s
dialpad and fixed-feature buttons to handle calls. For example, you can
use the system phone to select a specific outside line, and conduct the
call on the standard phone. Or, if someone is on a call using the
standard phone, someone else can put that call on hold by pressing [
Hold ]
on the system phone. To do this, it is not necessary to lift the handset of
the system phone. Held calls do not ring back at a standard phone in a
combination extension. To retrieve a held call from the standard phone,
use Direct Line Pickup—Active Line.
A standard phone’s message waiting light will not light when
Background Music is playing through the system phone’s speaker.
The ringer equivalence number (REN) of a standard device or the
combined REN of two devices cannot be greater than 2.0. (The REN of a
system phone is 0.0.)
3-12 Learning About Telephones