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Classification (physical method criterion)

•    dc signalling

•    in-band, monofrequency

•    in-band, multifrequency

•    out-band, monofrequency

•    code-type

•    common channel

Signalling in the access loop

•    dc signalling

•    DTMF (Dual Tonę MultiFrequency)

Intranetwork signalling

•    dc

•    ac

•    in-band signalling

•    out-of-band signalling

•    MF (multifrequency) codes

•    common channel signalling