Press and Hold Time (Zenitel Connect Pro)
From Zenitel Wiki
The Press and Hold Time defines the number of seconds a Call Button (DAK key/Input) must be pressed and held before the call is established.
The minimum delay is 0 seconds (default), and the maximum delay is 60 seconds.
Press and Hold Time is used to support the following use cases: Lift call
Configuration
Navigate to Devices and Connections > Configuration. Select the Device and click 
Under "Call Priority" adjust the slider to the wanted priority level.
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| Press an Hold timer |