VoIP abbreviations

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Abbr. Meaning
A/D Analog-to-digital converter
CO Central Office or telephone exchange
D/A [[w:Digital-to-analog converter Digital-to-analog converter]]
DTMF Dual-tone multi-frequency signaling
E.164 E.164 is a international public telecommunication numbering plan used in the PSTN
ISDN Integrated Services Digital Network
ITU International Telecommunication Union
ITU-T ITU Telecommunication Standardization Sector
POTS Plain old telephone service
PSTN Public Switched Telephone Network