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Combination Extensions
You can connect a standard device (such as a standard phone or an answering
machine) 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). An
extension with two devices connected to it is called a combination extension.
You cannot install two system phones on the same extension, and the combined
REN (Ringer Equivalence Number) of two devices on one extension cannot
exceed 2.0. (The REN for a system phone is 0.0.)
If your system phone has a built-in auxiliary jack, you can connect a standard
device directly to the phone, without using a bridging adapter—see “Using A
Direct Connection” below. If your system phone does not provide a built-in
auxiliary jack or if you want to connect two standard devices together, you must
use an AT&T 267F2 bridging adapter to combine the two devices on one
extension—see “Using a Bridging Adapter” below.
Using A Direct Connection
Figure 2 shows you how to connect a standard device directly to a system
phone, using the phone’s built-in auxiliary jack.
To Wall
Jack
To Standard
Device
Figure 2. Combination Extension Using Direct Connection
Using a Bridging Adapter
Figure 3 shows you how to connect a system phone and a standard device or
two standard devices together using the 267F2 bridging adapter.
AT&T
267F2
Adapter
Standard Device Only
System Phone or Standard Device
Wall Jack
Figure 3. Combination Extension Using Bridging Adapter
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Installation Guidelines