Some call-handling tasks and instructions differ depending on whether Cisco IP Communicator is on-hook or off-hook.
On-Hook--No calls are active, and you do not have an active dial tone. Cisco IP Communicator provides on-hook dialing, which allows you to enter or choose phone numbers before activating a dial tone.
Off-Hook--The handset is enabled, the speakerphone or headset is active, or any of several other methods are used to get a dial tone or to answer an incoming call.
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