VoIP and Skype
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- AOC-D: Advice of Charge during the call
- CD: Call Deflection
- SUB: Subaddressing
- CFB: Call forwarding on busy
- CFU: Call Forwarding Unconditional
- CFNR: Call Forwarding No Reply
- CCBS: Automatic recall on busy
- HOLD: Call Hold
- CW: Call Waiting
- 3PTY: Three-party conference
- CONF: Conference Call, Add-on
- TP: Terminal Parking in the public exchange
- CUG: Closed User Group
- CCBS: Completion of Calls to Busy Subscriber
- DDI: Direct Dialling In
- ECT: Explicit Call Transfer (refered to as TBCT, 2BCT, External Transfer, External Call Clearing and various other names by circuit providers)
- LH: Line Hunting
- MCLID: Malicious Call Identification
- MMC: Meet-Me Conference
- MWI: Message Waiting Indication
- MSN: Multiple Subscriber Number
- OCB-F: Outgoing Call Barring, Fixed
- OCB-UC: Outgoing Call Barring, User Controlled
- TP: Terminal Portability
- TH: Trunk Hunting
- UUS: User-to-User Signalling, services 1, 2 and 3
- En-bloc Dialling:
- Overlap Dialling:
