7.1 SPECIFICATIONS OF DTMF TONES
The characteristics of DTMF or MFPB tones are given in Q.24 recommendation [ITU-T-Q.24 (1988)]. Different telecommunication administrations may have their own specifications. A few regional specifications are listed in Table 7.2 for NTT, AT & T, and Danish administration with reference to the specifications given in Q.24. It is also suggested that the reader refer to local country PSTN standards directly wherever relevant.
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