AT&T MDC 9000 Specifications download pdf (Page 53)

Limitations

Each standard device requires one touchtone receiver to be available in order

to dial a call (intercom or outside). Each 206 module has one touchtone

receiver; each 400 module has two touchtone receivers. The combination of

modules in your system determines the number of standard devices that can

dial simultaneously. For example, if you have two 206 modules and two 400

modules, six standard devices can dial out at the same time. If seven standard

devices try to dial out simultaneously, the seventh device will not get dial tone

until one of the other six finishes dialing.

Also, because standard phones do not have system line buttons, feature

buttons, or dedicated function buttons, basic call handling procedures are

sometimes different from those for system telephones. In addition, the following

actions cannot be performed at a standard telephone:

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You cannot enter programming mode.

Because there are no line buttons on standard phones, users must use

Direct Line Pickup—Idle Line to select a specific line; otherwise, the

system selects an idle line automatically when the user dials a 9 at

intercom dial tone. (For information on Automatic Line Selection, see

Chapter 5.)

Unless Call Waiting (#316) is assigned to specific standard phone

extensions, there is no indication of a second call and an inside caller will

hear a busy tone if a standard phone is in use. If Call Waiting is

assigned, the user hears a call waiting tone (two beeps) when a second

call comes in for the extension. (The call waiting tone is not repeated.)

The user can use the switchhook to put the first call on hold and speak to

the party on the second call and to switch back and forth between the

two parties.

Users can make a voice-signaled call from a standard phone, but if users

try to make a voice-signaled call to a standard phone, it will ring because

the standard phone does not have a system speaker.

Users cannot use the System Password.

Users cannot access the following system features: Account Code

Entry, Background Music, Do Not Disturb, Exclusive Hold, Manual

Signaling, Privacy, Save Number Redial, VMS Cover, Voice Interrupt

on Busy, Voice Interrupt on Busy Talk-Back, or Voice Mailbox

Transfer.

Do not use Forced Account Code Entry with a standard phone,

because the phone will not be able to get dial tone and make calls.

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3-10 Learning About Telephones

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AT&T MDC 9000 Specifications Page 53