What do the acronyms PSTN and DTMF stand for in telephone terminology?
Answer:
PSTN
Short for Public Switched Telephone Network, which refers to the international telephone system based on copper wires carrying analog voice data. This is in contrast to newer telephone networks base on digital technologies, such as ISDN and FDDI.
Telephone service carried by the PSTN is often called plain old telephone service (POTS).
DTMF
Short for Dual Tone Multi-Frequency, the system used by touch-tone telephones. DTMF assigns a specific frequency (consisting of two separate tones) to each key so that it can easily be identified by a microprocessor. PSTN - Public Switched Telephone Network
DTMF - Dual Tone MultiFrequency DTFM = Dual Tone Multifrequency
PSTN = Public Switched Telephone Network or Public Service Telephone Network (less common) or Public Switched Telecommunications Network.
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