Samsung DS-5012L - Manual (Page 75)

Making Calls DS/ITP-5012L Phone User Guide
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A callback will be cancelled if not answered within 30 seconds. After
the call is finished, the callback reservation will be automatically
cleared.
Busy Station Camp-On
When you call another station and receive a busy signal, but you do not
want to wait for a callback, you can set a camp-on to the station. The called
station is made aware that your call is waiting.
1.
Press the [Selection] button for
[CAMP ON] displayed on the
screen.
z
Or, press [4][5], the function code
for ‘camp-on’ to an extension.
The called station will receive ‘off-hook’
ring tone repeated every few seconds to
indicate that your call is waiting.
2.
Wait for the called party to answer.
NOTE