AT&T 874 - Manual (Page 19)

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To drop one line:
Press the LINE button of the party you want to keep. The other line will be
dropped.
NOTE: Occasionally, the far-end parties on a conference call might not
hear one another.
Do Not Disturb
Use this feature to prevent interruptions during a call. When this feature is
activated you will not hear paging tones, voice paging, or incoming call
rings. Instead, the LINE light flashes and the INTERCOM light goes on to
signal a call or page. If you receive an intercom call, the INTERCOM light
flashes, and the intercom number calling you appears on the display.
1 Press to prevent interruptions.
2 Press again to resume normal call alerts.
Transfer a Call
You can transfer a call you answer to any other 874 phone. Once you
transfer a call, it can be picked up at any other 874 phone, not just at the
intercom number you called. Transfer calls fall into two categories:
announced and unannounced. Announced calls let you alert the other
person verbally that they have a transferred call. Unannounced calls alert
the other person by ringing.
Your phone reminds you every 30 seconds when a transferred call has not
been answered.
Transferring an Announced Call
1 Press p or I.
2 Enter the intercom number where you’re transferring the call.
3 Begin speaking to alert the other person there’s a call.
To answer an announced transfer call, press the LINE button of the call.
Transferring an Unannounced Call
1 Press T.
2 Enter the intercom number where you’re transferring the call.
3 Hang up.
To answer an unannounced transfer call, pick up the handset or press the
LINE button of the call to use the speakerphone.
OPERATION