Panasonic KX-T336 System Reference Manual page 291

Programming
Conditions
Retrieving a call held on GCO from SCO.
Assuming that Trunk Group 01 consists of the following CO lines and
GCO and SCO buttons are assigned as follows.
TG01 CO line 1011
CO line 1012
CO line 1013
CO line 1014
GCO-01 is in use at EXT.100 now.
EXT.100
GCO-01 is lit in
green .
In case, CO line 1011 is captured by pressing GCO-01.
When a call on GCO-01 is put on hold at EXT.100, GCO-01 begins to
flash in green and SCO-1011 on EXT.101 begins to flash in red as follows:
EXT.100
EXT.101 can retrieve a call held on GCO-01 by simply pressing the red
flashing SCO-1011.
System Programming
"Extension-Station (2/3)",
Type and Number
None
3-D-17-2
(70695)
EXT.101
SCO-1011 is lit
in red .
EXT.101
Reference
VT Dumb
9-G-1.02 10-C-24.00