Panasonic KX-TD500 System Reference Manual page 735

2.02 Last Number Redial (LNR)
Description
Last Number Redial feature automatically saves
the last dialed telephone number of the outside
party and allows the attendant to make the call to
the same destination again by simply pressing
the REDIAL key (programmable key).
Assign REDIAL key to programmable key in
advance.
Programming
Attendant Management
REDIAL key
Conditions
Up to 32 digits except the feature number for
selecting a CO line can be memorized
automatically as the last dialed number.
"* ", "#", "PAUSE", or "SECRET" are counted as
one digit respectively.
Last number redialing memory is renewed
automatically every time a new outgoing CO call
is made (including when ringback tone, DND
tone or busy tone is returned) and even one digit
is sent to CO line. Dialing a feature number for
selecting a CO line only does not renew the
memorized number.
Operation
LOOP
REDIAL
Reference
6-C-10.00
6-D-7
1. Press an idle LOOP key.
• The SRC indicator lights and
dial tone sounds.
2. Press the REDIAL key
(programmable key).
• After dial tone, ringback tone
sounds.
• When the called party answers,
start the conversation.