AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 6)

Important
BusinessPhone – Cordless DT412/DT422/DT432 6
Important
This section describes the information that is important to know
before you use the Cordless phone and the functions described.
Note: This User Guide describes the supported
BusinessPhone Communication Platform functions
together with the most commonly used telephone specific
functions. All telephone specific functions are listed in the
menu structure “ Menu structure ” on page 16.
Preparing for use
Before using your Cordless the first time you have to charge and
connect the battery, see section “ Installation ” on page 110.
Note: Place the Cordless in the charger and charge it for at
least one hour before using it the first time.