Siemens 600Series - Manual (Page 34)

1-20 ROLMphone 300/600 Series User Guide
Ring Volume
Use the slide control to adjust the ringing volume of your telephone.
The slide control is located underneath the front of the ROLMphone
300/600 series telephones. The volume remains at the level you set it
until you adjust it again.
Ring Tone
When first installed, your telephone will have a predetermined ring.
You can change your telephone’s ring tone to any one of eight tones.
For information about how to do this, see “Changing Your
Telephone’s Ring Tone” on page 2-22.