Panasonic KX-TD500 System Reference Manual page 456

6.02 Automatic Callback-Station
Description
If busy tone is heard when calling an extension
user, dialing "6" and hanging up causes
Automatic Callback to the caller as soon as the
called party concludes conversation:
When callback ringing for the caller starts,
answering by off-hook or pressing the SP-
PHONE button offers calling the other party
automatically.
Off-hook prior to the start of call-back ringing
cancels this function.
Also no answer during four ringings after the start
of call-back ringing cancels this function.
Programming
None
Conditions
Up to four extensions are able to assign this
function to one extension at the same time.
The fifth extension attempting to set this function
is rejected by reorder tone.
If you do not dial "6" within 10 seconds after
hearing busy tone, you hear reorder tone and
cannot execute this feature.
Even if an extension user sets Call Forwarding-
No Answer or Do Not Disturb, Automatic
Callback-Station is effective to that extension.
Automatic Callback-Station cannot be set by the
extension which has a call on consultation hold.
Operation
1. Lift the handset or press the SP-
PHONE button.
• You hear dial tone 1.
• The indicator on the PDN
2. Dial the directory number of the
other extension.
• You hear busy tone 1 or 2.
3. Dial "6".
With DPITS (only KX-
T7235/7230), press the C.BAK
(S3) button.
C.BAK C.BAK
• You hear confirmation tone 2
S3 S3
• If your PITS has a display, it
4. Replace the handset.
Answering callback ringing
As soon as the other extension user concludes
the conversation, callback ringing starts.
1. Lift the handset or press the SP-
PHONE button.
• You hear ringback tone.
4-C-22
button lights in green.
and reorder tone.
shows:
Callback Ext xxxx
Directory number
Calling the other extension
starts.