AASTRA 600d for OpenCom 1000 User Guide (with bookmarks) EN - Manual (Page 31)

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Basic functions
Do not hold the handset up to your ear in handsfree mode or when the ringer is ringing as the
volume can be very loud.
Acknowledging an appointment/alarm clock
You are notified of an appointment or alarm clock by the specified ringer and the LED flashing red
for approx. 45 sec. The display shows the corresponding text. You can acknowledge the signalling
with Esc.
Adjusting the volume of the earpiece during the call
Aastra 610d
Press the +/- sidekeys to increase or reduce the volume of the current call. Alternatively you can also
use the navigation keys √ (quieter) and ® (louder); to do so, first press the key with a long key-
press. Then adjust the volume by briefly pressing the key as required.
Aastra 620d/630d
Press the upper or lower sidekey to increase or reduce the volume of the current call. If the keys are
programmed with functions, first press the relevant key with a long keypress. Then adjust the
volume by briefly pressing the key as required.
Alternatively you can also use the navigation keys √ (quieter) and ® (louder); to do so, first press
the key with a long keypress. Then adjust the volume by briefly pressing the key as required.
Note
To save the new setting (i.e. to store it as a menu entry) press the Ok softkey when making the
adjustment.
Switching the ringer on/off
Switch off: Press the star key and hold for a moment, the symbol appears on the display.
Switch on: Press the star key again and hold for a moment, the symbol will switch off.
Switching ringer off at call
If you want to switch off the ringer for a call that has just come in, press the C key. You can still
accept the call as long as the caller has not hung up.