Press and Hold Time (Zenitel Connect Pro)
From Zenitel Wiki
The Press and Hold Time defines how many seconds a Call Button (DAK key or input) must be continuously pressed before a call is initiated.
The delay can be set from 0 seconds (default) up to 60 seconds. Press and Hold Time is typically used in scenarios where accidental activation must be avoided—for example, lift (elevator) call functions.
Configuration
Navigate to Devices and Connections > Configuration. Select the Device and click 
Under "Press and Hold Time" adjust the slider to the wanted delay.
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| Press an Hold timer |