AT&T Lucent Technologies PARTNER Plus Installation And Use Manual page 63

Combination Extensions
The combined ringer equivalence
number (REN) of two devices on
a combination extension must be
no more than 2.0
4-10 Using Telephones
A combination extension is an extension with two standard devices
connected— a system telephone and a standard device. For instructions on
how to install a combination extension, see Figure 2-5 in Chapter 2.
The following are examples of useful combination extensions:
System phone plus standard telephone, for power failure backup on exten-
sions 10, 16, 22, and 28.
System phone plus answering machine
System phone plus fax machine
System phone plus tip-ring headset
System phone plus external alert (such as a bell or chime).
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 that several home telephones share a single number. 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 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:
Both phones share the same extension number.
Both phones share the same voicepath; when either one is busy, the exten-
sion is busy.
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 pat-
terns, see "Lights" at the beginning of this chapter.
Calls ring at both phones.
Yo can handle a call on the standard telephone by pressing buttons on the
U
system telephone. 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 telephone, 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 cannot be
retrieved from a standard phone in a combination extension.)
You can also activate dial code features from the system telephone while the
standard phone is on a call. Simply press [Feature] plus the two-digit dial
code.
If you make a voice-signalled intercom call to a combination extension with a
system phone, only the system phone signals.