Panasonic KX-TGP500 User Manual page 36

Programming using the Base Unit (KX-TGP550 only)
:
*2 We recommend programming this setting with your administrator. Contact your administrator for
further information.
*3 This tone lets you know when you receive an outside call while you are on the other outside call or an
intercom call.
*4 When the ringer volume is turned off, ~ is displayed and the base unit does not ring for outside calls.
However even when the ringer volume is set to off, the base unit rings at the low level for intercom calls
(page 48).
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Document Version 2012-08