Panasonic KX-TDA15 Features Manual page 407

Tone Patterns (Default)
Hold Alarm Tone
Call Waiting Tone 1
Call Waiting Tone 2
Ring Tone Patterns (Default)*
Single
Double
Triple
S-Double
*: The duration of a ring tone may vary by country/area.
1 s
1 s
15 s
OR
3.2 Tones/Ring Tones
Feature Guide 407