On the Panasonics, ringtones referred to as ring patterns. There are 32 possible ring patterns. To change the ring tone follow the below steps. It can be done by the number, not by the hand- set itself.
Click the “Menu” softkey
Select “Settings Handset” by clicking the “OK” soft key
Select “Incoming Option” by clicking the “OK” soft key
Select “Ringer Type” by clicking the “OK” soft key
Select the number that you want to change the ringer for by clicking the “OK” soft key.
Select “Ring Pattern” by clicking the “OK” soft key
Then go through and listen the ringtone options by using the navigation keys. Once you are satisfied, click the “OK” soft key.