Panasonic GD87 - Manual (Page 64)

Receiving a Second Call
If Call Waiting is enabled on a second call can be received. This
is enabled from Phone Option > Call Service > Calls > Call
Waiting.
It is not possible to have more than one fax or data call at a
time. All voice calls must be ended before you can make or
receive a fax or data call.
Accept / Reject a Second Call
Note: If you accept the second call, the current call is placed on
hold.
End Current Call and Receive Second Call
With a call waiting:
Operation During Two Calls
Swapping Between Calls
An icon indicates the current call.
End Current Call
The held call remains held.
End Both Calls
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Advanced Operation
Advanced
Operation
Select
Accept or
Reject
Select
Swap
Select
End
Press any key except for
the following two: and