Panasonic KX-T336 System Reference Manual page 1594

S
SCO Single CO
SDN Secondary Directory Number
SLC Single Line Telephone Circuit
SLT Single Line Telephone
SMDR Station Message Detail Recording
SNR Saved Number Redial
SRC Source
T
TAFAS Trunk Answer From Any Station
TG Trunk Group
TSW Time Sharing Switch
U
UCD Uniform Call Distribution
UNA Universal Night Answer
W
WT Warning Tone
18-2