AT&T Partner II - Manual (Page 102)

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Switchhook
Ringing Patterns. Your Centrex system determines the ringing pattern
you will generally hear when calls ring at your phone. (For example, there
may be different ringing patterns for inside and outside calls.) If someone
makes an intercom call to your phone, you will hear a repeated pattern of
two rings, one long and one short (RING ring . . . RING ring . . . RING
ring . . .).
When you are on a call, pressing the switchhook connects you with Centrex, so
you can access Centrex services. Pressing the switchhook down for 1/4 to 1
second sends Centrex a signal called a “switchhook flash.” If you press the
switchhook quickly and nothing happens, try again, pressing a little longer. (If
you are on an intercom call made to you from an MLS- or MLC-model phone,
pressing the switchhook disconnects the call.
Limitations
Because some standard phones do not have line buttons, feature buttons, or
dedicated function buttons, call handling is different than for MLS- or
MLC-model phones. The actions below cannot be performed from those
standard phones using equipment features. However, comparable Centrex
features may be available for use by those standard phones.
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Because there are no line buttons, you can make calls only on your own
Centrex line.
You cannot make intercom calls.
You cannot make a voice-paging call from a standard phone. If you use
an MLS- or MLC-model phone to make a voice-paging call to a standard
phone, the standard phone rings.
You cannot enter program mode.
If the standard phone has a message light, it will not work.
You cannot use the equipment features (see pages 6-10 and 6-11) or
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Speed Dial Numbers that are available for MLS- and MLC-model phones.
Feature Phones
A feature phone is a standard telephone that has feature buttons in addition to
the regular 12-key dial pad. For example, there are feature phones that have
built-in speakerphones, programmable auto dial buttons, last number redial
buttons, hold buttons, and other dedicated feature buttons. Some of the features
on these phones will work with your equipment controller, but many of the
limitations above apply to feature phones as well.
Some feature phones include a “Recall” or “Flash” button that executes a
switchhook flash. You can use this button to send a switchhook flash (described
above) when you want to access Centrex services.
6-8 Using Telephones