Panasonic KX-NS500 - Page 567

Tone Patterns (Default)
Hold Alarm Tone
15 s
Call Waiting Tone 1
Single
Double
Triple
S-Double
1 s
Call Waiting Tone 2
Ring Tone Patterns (Default)*
OR
1 s
* The duration of a ring tone may vary by country/area.
Feature Guide 567
6.2.1 Tones/Ring Tones