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ES- Extension service-voice grade
ET- Entrance facility-telegraph grade
EU- Extension service-telegraph grade
EV- Enhanced Emergency reporting trunk
EW- Off network MTS/WATS equivalent service
FD- Private line-data
FG- Group-supergroup spectrum
FR- Fire dispatch
FT- Foreign exchange trunk
FW- Wideband channel
FV- Voice grade facility
FX- Foreign exchange
HP- Non-DDS Digital data 2.4 kb/s
HQ- Non-DDS Digital data 4.8 kb/s
HR- Non-DDS Digital data 9.6 kb/s
HW- Non-DDS Digital data 56 kb/s
IT- Intertandem tie trunk
LA- Local area data channel
LL- Long distance terminal line
LS- Local service
LT- Long distance terminal trunk
MA- Cellular access trunk 2-way
MT- Wired music
NA- CSACC link (EPSCS)
NC- CNCC link (EPSCS)
ND- Network data line
OI- Off premises intercommunication station line
ON- Off network access line
OP- Off premises extension
OS- Off premises PBX station line
PA- Protective alarm (AC)
PC- Switched digital-access line
PG- Paging
PL- Private line-voice
PM- Protective monitoring
PR- Protective relaying-voice grade
PS- MSC constructed spare facility
PV- Protective relaying-telegraph grade
PW- Protective relaying-signal grade
PX- PBX station line
PZ- MSC constructed circuit
QU- Packet asynchronous access line
QS- Packet synchronous access line
RA- Remote attendant
RT- Radio landline
SA- Satellite trunk
SG- Control/Remote metering signal grade
SL- Secretarial line
SM- Sampling
SN- Special access termination
SQ- Equipment only-customer premises
SS- Dataphone select-a-station
TA- Tandem tie-trunk
TC- Control/Remote metering-telegraph grade
TF- Telephoto/Facsimile
TK- Local PBX trunk
TL- Non-tandem tie trunk
TR- Turret or automatic call distributor (ACD) trunk
TT- Teletypewriter channel
TU- Turret or automatic call distributor (ACD) line
TX- Dedicated facility
VF- Commercial television (full time)
VH- Commercial television (part time)
VM- Control/Remote metering-voice grade
VO- International overseas television
VR- Non-commercial television (7003,7004)
WC- Special 800 surface trunk
WD- Special WATS trunk (OUT)
WI- 800 surface trunk
WO- WATS line (OUT)
WS- WATS trunk (OUT)
WX- 800 service line
WY- WATS trunk (2-way)
WZ- WATS line (2-way)
ZA- Alarm circuits
ZC- Call and talk circuits
ZE- Emergency patching circuits
ZF- Order circuits, facility
ZM- Measurement and recording circuits
ZP- Test circuit, plant service center
ZQ- Quality and management circuits
ZS- Switching, control and transfer circuits
ZT- Test circuits, central office
ZV- Order circuits, service
SERVICE CODES FOR LATA ACCESS
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HC- High capacity 1.544 mb/ps
HD- High capacity 3.152 mb/ps
HE- High capacity 6.312 mb/ps
HF- High capacity 6.312
HG- High capacity 274.176 mb/s
HS- High capacity subrate
LB- Voice-non switched line
LC- Voice-switched line
LD- Voice-switched trunk
LE- Voice and tone-radio landline
LF- Data low-speed
LG- Basic data
LH- Voice and data-PSN access trunk