Panasonic KX-TD500 System Reference Manual page 206

16.00 Tone and Ringing Patterns
Description
This system offers various tone patterns and
ringing patterns, as listed below:
Dial tone 1
Dial tone 2
Dial tone 3
Dial tone 4
Busy tone 1
Busy tone 2
Busy tone 3
Reorder tone
Ringback tone
Do Not Disturb (DND)
tone
Confirmation tone 1
Confirmation tone 2
Confirmation tone 3
Confirmation tone 4
Warning tone
CO-CO timeout
warning tone
Held Call Reminder
Call waiting tone
Tone Patterns
1 sec
125 msec
625
500
750
750
3000
1000
625
750
1250
15 sec
15 sec
3-B-26
Frequency
440HZ
440HZ
440HZ
440HZ
480HZ+620HZ
480HZ+620HZ
620HZ
480HZ+620HZ
440HZ+480HZ
350HZ+440HZ
620HZ
620HZ
620HZ
620HZ
620HZ
480HZ+620HZ
350HZ+440HZ
350HZ+440HZ