Sounds
Handset ring tones
Group ring tones
Handset ring tone volume
Settings
Handset ring tones
To set the handset ring tone
You can set the ring tone heard on the handset when receiving a call.
Press to enter the carousel
Scroll to Sounds and select
Press to select Handset ring tones
Press to select External ring tones
Browse through the list to hear the ring tones
Press to select your ring tone
To set the handset ring tone
You can set the ring tone heard on the handset when receiving an internal call.
Press to enter the carousel
Scroll to Sounds and select
Press to select Handset ring tones
Scroll to Internal ring tone and select
Browse through the list to hear the ring tones
Press to select your ring tone
Sounds
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http://www.philips.com/faqs/dect