AT&T 2320 - Manual (Page 18)

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Call Timer
When the handset is on a call,the screen displays a
timer whether the call is external or intercom.
For example:
Speakerphone
When the handset speakerphone is activated, you can
use the phone hands-free. Stand the handset on a flat
surface (not in the base) and continue your
conversation.
Make a Call
1 Press , then dial the number
— OR —
Dial the number, then press
.
2 To end the call,press again
— OR —
Place the handset in the base.
Answer a Call
1 Press to answer a call.
2 To end the call,press again
— OR —
Place the handset in the base.
Switch Between Handset and Speakerphone
While on a call you can press to switch to
speakerphone. While on a speakerphone call,press
to return to the handset.