Panasonic KX-TGM420 Operating Instructions Manual page 75

If you subscribe to both Caller ID and Call
Waiting with Caller ID services, the 2nd caller's
information is displayed on the unit that is in use after
you hear the call waiting tone.
Handset
1 Press [FLASH] to answer the 2nd call.
2 To switch between calls, press [FLASH].
Base unit
1 Press [FLASH/CALL WAIT] to answer the 2nd
call.
2 To switch between calls, press [FLASH/CALL
WAIT].
Note:
• Please contact your phone service provider for
details and availability of this service in your area.
Temporary tone dialing (for rotary/pulse service
users)
Press [*] before entering access numbers which
require tone dialing.
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