Cisco 7970 Series - Manual (Page 56)

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Using a Handset, Headset, and Speakerphone
You can use your phone with a handset, headset, or speakerphone.
If you want to... Then...
Use the handset Lift it to go off-hook; replace it to go on-hook.
The ringing line is automatically selected. Ask your system
administrator about options to always select the primary line.
Use a headset Press to toggle headset mode on and off. You can use a headset
with all of the controls on your phone, including and
.
If you use AutoAnswer, see Using AutoAnswer, page 57.
If you use a headset that supports wideband, you might experience
improved audio sensitivity if you enable the wideband setting on
your phone (this setting is disabled by default). To access the
setting, choose
> User Preferences > Audio Preferences >
Wideband Headset. If the Wideband Headset setting shows as
dimmed, then this setting is not user controllable.
Check with your system administrator to be sure your phone
system is configured to use wideband. If the system is not
configured for wideband, you may not detect any additional audio
sensitivity even when using a wideband headset. To learn more
about your headset, refer to the headset documentation or ask
your system administrator for assistance.
Use the speakerphone Press to toggle speakerphone mode on or off.
Many of the actions you can take to dial a number or answer a call
will automatically trigger speakerphone mode, assuming that the
handset is in its cradle and
is not lit.
Switch to the speakerphone or a
headset (from the handset)
during a call Press or , then hang up the handset.