Requirements; Combination Extensions; Connecting Standard Devices - Avaya Partner 18 Programming And Use Manual

Requirements

An industry-standard device must meet the following conditions:
It must be non-proprietary. That is, it cannot be made specifically for use
on a particular telephone system. (For example, you cannot connect an
AT&T MERLIN® phone because it is specifically designed for use on a
MERLIN system.)
Its Ringer Equivalence Number (REN*) cannot be greater than 2.0. (The
REN is shown on a label on the device, usually on the bottom.)
You can connect a standard two-line device to the system, but for best
results it should be installed and used as if it were a single-line device.

Connecting Standard Devices

You can connect a standard device so that it is on an extension by itself, or so
that it shares an extension with another piece of equipment (either another
standard device or a system phone) as long as the REN of the two devices
together does not exceed 2.0. (System phones have 0.0 REN.) For example,
you can connect a standard phone and an answering machine to the same
extension. An extension with two devices connected to it is called a
combination extension. You cannot connect two system phones on one
extension. The PARTNER Plus Communications System Installation guide
provides installation instructions.
*
REN is a measure of the power it takes to ring a phone. The typical home phone line handles 4.0–5.0 RENs;
each extension jack in your system handles up to 2.0 RENs.
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Overview