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� Home : ITU-T : Publications : Recommendations : Q�Series : Q.400SerSup4 : Q.400SerSup4 (11/88)
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Q.400SerSup4�:�In-band line signalling for 3 kHz spaced channels �

Recommendation Q.400SerSup4 (11/88)

Approved in 1988-11-25

Status : Superseded

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