AASTRA 600d for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 29)

Functions
27
Functions
Operational Controls on the Mobile Unit
Key assignment (default)
Emergency key (Aastra 630d only)
Receiver
Aastra 610d:
+/- Keys (volume adjust)
Aastra 620d/630d:
3 Side keys (programmable)
and volume adjust
Navigation keys
(partly programmable)
Speaker/Handsfree use
Call key/Enquiry key
Headset connector
Ringer on/off
LED
Hotkey (programmable)
(not Aastra 610d)
Display
Rear: Loudspeaker
3 Softkeys (partly programmable)
C key (delete)
End key / On-Off key
Number keys / Letter keys
Mini USB connector
(not Aastra 610d)
Keylock
Microphone