Intro to IP Telephony
Basic Terminologies
PBX vs. IP-PBX
 
 














Basic Terminologies  




A  C   D   E   F   H   I   L   M   N   O   P   Q   R   S   T   U   V   W   X  



A
  ACR   Absolute Category Rating
  ACD   Automatic Call Distribution
  ADPCM   Adaptive Differential Pulse Code Modulation; coding of speech at 32 Kbps
  ANI   Automatic Number Identification
  ATM   Asynchronous Transfer Mode




C
  C. O. Line   Central Office Line
  CAP   Competitive Access Protocol
  CBR   Constant Bit Rate
  CIOA   Classical IP over ATM
  CNG   Comfort Noise Generation
  CODEC   Compressor/decompressor
  CPE   Customer Premises Equipment "Individual user"
  CSU/DSU   Channel Service Unit/Digital Service Unit
  CTI   Computer Telephony Integration




D
  DHCP   Dynamic Host Configuration Protocol
  Diffserv   Differentiated Services
  DNS   Domain Name System
  DSP   Digital Signal Processor
  DSS/BLF   Direct Station Select /
Busy Lamp Field; Attendant Console
  DTMF   Dual Tone Multiple Frequency




E
  EDI   Electronic Data Interchange - a series of standards which provide computer to computer exchange of business documents between different companies' computer over phone lines




F
  FAE   Field Application Engineer
  FCC   Federal Communication Commission that controls all electronic equipment examining/testing
  FDDI II   Fiber Distributed Data Interface II
  FR   Frame Relay
  FRAD   Frame Relay Access Device
  FTP   File Transfer Protocol
  FTTC   Fiber to the Curb
  FTTH   Fiber to the Home
  FXO   Foreign Exchange Office
  FXS   Foreign Exchange Station




G
  G.711   Codinng of speech at 64 Kbps
  G.723.1   Codinng of speech at 5.3 / 6.3 Kbps
  G.729a   Codinng of speech at 8 Kbps
  GSM   Global System for Mobile Communications
  GUI   Graphical User Interface




H
  H.323   A standard approved by the International Telecommunication Union (ITU) that defines how audiovisual conferencing data is transmitted across networks.
  HDLC/SDLC   High Data Link Control/Synchronous Data Link Control
  HDSL   High-bit-rate Digital Subscriber Line
  HFC   Hybrid Fiber Coaxial
  HomePNA   Home Phone Networking Alliance




I
  IETF   Internet Engineering Task Force
  IP   Internet Protocol
  IPPBX   Internet Protocol-Private Branch Exchange
  ISA   Integrated Services Architecture or Interactive Services Association or Industry Standard Architecture
  ISDN   Integrated Services Digital Network
  ISP   Internet Service Provider
  ITS   Internet Telephony Server
  ITSP   Internet Telephony Service Provider
  ITU-T   International Telecommunications Union-Telecommunications
  IVR   Interactive Voice Response
  IXC   Interexchange Carrier




L
  LAN   Local Area Network
  LANE   LAN Emulation
  LDAP   Lightweight Directory Access Protocol
  LEC   Local Exchange Carrier
  LIS's   Logical IP Subnetworks




M
  MBR   Minute Bit Rate
  MGCP   Media Gateway Control Protocol
  MIPS   Million Instructions Per Second
  MIS   Management Information System
  MOS   Mean Opinion Score
  MPEG   Moving Pictures Expert Group
  MPLS   Multiprotocol Label Switching Specification
  MPOA   Multiprotocols over ATM




N
  NT   Network Termination or it can mean New Technology just like Windows NT
  NTI   Network Termination Type 1 - a small box that attaches to an ISDN BR line




O
  ODM   Original Designing Manufacturer
  OEM   Original Equipment Manufacturer




P
  PBX   Private Branch Exchange, also known as PABX - Private Automatic Branch Exchange
  PCM   Pulse Code Modulation
  PDU   Protocol Data Units - also called Datagrams
  PING   Packet Internet Groper
  POP   Point of Presence
  POTS   Plain Old Telephone Service
  PPP   Point-to-Point Protocol
  PSTN   Public Switched Telephone Network




Q
  QoS   Quality of Service




R
  RSVP   Reservation Protocol
  RTCP   Real Time Transport Protocol Control Protocol
  RTP   Real Time Transport Protocol
  RTSP   Real Time Streaming Protocol




S
  SIP   Session Initiation Protocol
  SIVR   Speaker-Independent Voice Recognition
  SMTP   Simple Mail Transfer Protocol - for email
  SNA   System Network Architecture
  SNMP   Simple Network Management Protocol
  SOC   System on a Chip
  SONET   Synchronous Optical Network




T
  T1   1.544 Mbps = 24*64 Kbps
  TAPI   Telephony Application Programming Interface
  TCO   Total Cost of Ownership
  TCP/IP   Transmission Control Protocol/Internet Protocol
  TDM links   Time Division Multiplexed links
  TTL   The Time To Live
  TUI   Telephone User Interface




U
  UDP   User Datagram Protocol
  UnPBX   PC-based PBX using computer instead of networking




V
  VAD   Voice Activity Detection
  VAR   Value Added Reseller
  VBR   Variable Bit Rate
  VIC   Voice Interface Card
  VOD   Video on Demand
  VoIP   Voice over IP
  VON   Voice on Data Network
  VPN   Virtual Private Networking




W
  WAN   Wide Area Network
  WAP   Wireless Application Protocol




X
  XDSL   X Digital Subscriber Line - X means the varieties of DSL