AT&T CL4939 - Manual (Page 31)

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Telephone operation
Options while on calls
Flash/call waiting
If you subscribe to call waiting service from your
telephone service provider, you hear a beep if
someone calls you while you are already on a call.
Press FLASH to put your current call on hold
and take the new call.
Press
FLASH anytime to switch back and forth
between calls. For more information on caller
ID with call waiting, refer to
About caller ID on
page 34.
NOTES:
Use FLASH to access other telephone company
subscriber services, as described by your
telephone service provider.
The telephone cannot display the caller ID
information if another telephone on the same
line is in use. Make sure all extensions are not
in use.
Temporary tone dialing
If you have dial pulse (rotary) service only, use
this feature to temporarily switch from dial pulse
(rotary) service to touch-tone dialing during a call.
During a call, press TONE*. Buttons pressed
after this send touch-tone signals.
Use the dial pad keys to enter the relevant
number. The telephone sends touch-tone
signals.
The telephone automatically returns to pulse
dial mode after you end the call.
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