Aastra 55i IP Phone - How do I restart the IP phone?

Model 55i IP Phone User Guide 175
Model 536M and 560M Expansion Modules
Using the Expansion Modules
536M Expansion Module
After configuring the softkeys on the 536M Expansion Module, you can record the
name of the softkey on the paper labels provided with the Expansion Module. Press
the softkey you want to use when applicable.
Lock Phone
BLF Key
Office (speeddial)
Softkeys