Specification :

Standard services:
- HOLD Call hold
- CW Call waiting
- 3PTY Tripartite connection
- MSN Multiple subscriber numbers
- CLIP/ CLIR Calling line identification presentation/ Restriction
- COLP/ COLR Connected line identification presentation/ Restriction
- MCID Malicious call identification
- TP Terminal portability
- CFx Call transfer
- CCBS Call completion on busy subscriber

Local services:
- CLI Call identification
- PICK
- DIST Calling signals distinguishing
- FDC Fire direct line
- ICT Internal connection transfer
- IC Internal connection between analogue ports