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Audible tones are used in the telephone system to indicate the progress or disposition
of a call. Precise dial tone consists of Current day "precise" tones consist of a
summation of two low distortion sine waves.
The Dial Tone signal is used in Public Switched Telephone Networks to indicate that
the telephone network switching equipment has recognized that a telephone has gone
off-hook, and the switching equipment is prepared to receive the dialed digits or DTMF
codes.
The Ring-back signal is used in Public Switched Telephone Networks to indicate to the
caller that the called number is not busy, and that the line is being "rung" or signaled
that an incoming call is present. In most cases, the ring-back signal has the same
cadence as the ring generators used in that country, but the ring-back and ring
generators are usually not synchronized with one another.
The Busy signal is used in Public Switched Telephone Networks to indicate that the
called party is already taking another call. On most switching systems, the busy signal
will be emitted until the caller goes on-hook.
Note:
If disconnect tone is single-frequency, user has to configure the same frequency value
of “Low frequency” and “High frequency”; the same level of “Low frequency” and “High
frequency”
For On/Off cadence, user must set “1023” instead of “0”, if there is only one set of
cycle, please as in second set columns
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