Uniden WDECT2385 - Manual (Page 36)

If you have Call Waiting service and a call waiting tone sounds during a call:
AUSTRALIA:
Press , then 2 to switch between callers.
NEW ZEALAND:
Press to switch between callers.
If you subscribe to Caller ID on Call Waiting then when the Call
Waiting Tone is heard during a call the 2nd caller's number will
appear on the display (see page 55 for Caller ID Features).
If you wish to speak to the 2nd caller;
Press , then 2 to switch between callers.
Caller ID on Call Waiting (Australia Only)
! Call Waiting on Caller
ID currently not
available in NZ.