List of Abbreviations
| AA → Automated Attendant |
| ACD → Automatic Call Distribution |
| ANI → Automatic Number Identification |
| APT → Analog Proprietary Telephone |
| ARS → Automatic Route Selection |
| BGM → Background Music |
| CCBS → Completion of Calls to Busy Subscriber |
| CDPG → Call Distribution Port Group |
| CF → Call Forwarding—QSIG |
| CLI → Calling Line Identification |
| CLIP → Calling Line Identification Presentation |
| CLIR → Calling Line Identification Restriction |
| CNIP → Calling Name Identification Presentation |
| CNIR → Calling Name Identification Restriction |
| COLP → Connected Line Identification Presentation |
| COLR → Connected Line Identification Restriction |
| CONP → Connected Name Identification Presentation |
| CONR → Connected Name Identification Restriction |
| COS → Class of Service |
| CPC → Calling Party Control |
| CS → Cell Station |
| CT → Call Transfer—QSIG |
| CTI → Computer Telephony Integration |
| DHCP → Dynamic Host Configuration Protocol |
| DID → Direct Inward Dialing |
| DIL → Direct In Line |
| DISA → Direct Inward System Access |
| DND → Do Not Disturb |
| DPT → Digital Proprietary Telephone |
| DSS → Direct Station Selection |
| DTMF → Dual Tone Multi-Frequency |
| EFA → External Feature Access |
| FWD → Call Forwarding |
| G-CO → Group-CO |
| ICD → Incoming Call Distribution |
| ICMP → Internet Control Message Protocol |
| IP-PT → IP Proprietary Telephone |
| IRNA → Intercept Routing—No Answer |
| ISDN → Integrated Services Digital Network |
| L-CO → Loop-CO |
| LCS → Live Call Screening |
| LED → Light Emitting Diode |
| NDSS → Network Direct Station Selection |
| OGM → Outgoing Message |
| OHCA → Off-hook Call Announcement |
| OPX → Off premise Extension |
| PDN → Primary Directory Number |
| PIN → Personal Identification Number |
| PING → Packet Internet Groper |
| PRI → Primary Rate Interface |
| PS → Portable Station |
| PT → Proprietary Telephone |
| S-CO → Single-CO |
| SDN → Secondary Directory Number |
| SIP → Session Initiation Protocol |
| SLT → Single Line Telephone |
| SMDR → Station Message Detail Recording |
| SNMP → Simple Network Management Protocol |
| SNTP → Simple Network Time Protocol |
| SVM → Simplified Voice Message |
| TAFAS → Trunk Answer from Any Station |
| TEI → Terminal Endpoint Identifier |
| TRG → Trunk Group |
| TRS → Toll Restriction |
| UCD → Uniform Call Distribution |
| VM → Voice Mail |
| VoIP → Voice over Internet Protocol |
| VPS → Voice Processing System |
| XDP → EXtra Device Port |