Siemens 150 Key Settings (+/)

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Key Settings (+/–)
The Plus and Minus keys allow for the individual setting of the levels of speech,
ringing and ring tones.
Change Speech Volume
- whilst busy on a call
- press + or – keys to adjust Speech volume
- press + and – keys simultaneously to store setting
Change Ringing volume or Ring Tone frequency
-Do not lift handset
- press + and – keys simultaneously
- press 1 and then + or – keys to adjust Ringing volume
- or 2 and then + or – keys to adjust Ring Tone frequency
- press + and – keys simultaneously to store setting