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ITU-T Q.25 1988 Edition, November 1, 1988
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SPLITTING ARRANGEMENTS AND SIGNAL RECOGNITION TIMES IN "IN-BAND" SIGNALLING SYSTEMS
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General

In each "in-band" signalling system precautions should be taken so that, when the signalling in that system is taking place:

no interference in the voice-frequency range from outside the system can pass into the system (i.e. into the transmission path between the sending end and the receiving end of the voice-frequency signals), and

as far as possible, no signalling current used in the system can pass into other systems, connected in tandem.