Using Ring Tones
Each extension of your phone can have a different ring tone.
To change a ring tone:
Press the Setup button.
Scroll to User Preferences and press Select.
Scroll to Audio Preferences and press Select.
Scroll to the extension for which you want to select a ring tone and press the Right Arrow key.
Scroll through the ring tones and press Play to play the highlighted ring tone.
Press Select to choose the highlighted ringtone for that extension.
Cisco SPA525G2