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Caller ID StandardsStandards
covering aspects of Caller ID data transmission and
signaling have been published by various international
standards committees, regulatory agencies, and network
carriers. In most cases, the standards fall into one of
two different categories, depending on how the Caller ID
data is transmitted. They are by means of FSK
(Frequency Shift Key) modulation or DTMF
(Dual Tone Multi-Frequency) coding.
A key factor in determining
what transmission method is used within a given region is
the capabilities of the central office switches. Various
central office switches may lack the capability of
generating an FSK carrier or DTMF tones.
FSK Based Caller ID Standards
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