A dial tone is a telephony signal used to indicate that the telephone exchange is working, on off-hook it can be header. Telephone is ready to accept a calls when handset is placed on cradle. The tone stops when the first numeral is dialed. If no digits are forthcoming, the permanent signal procedure is invoked, and have to put the handset on cradle, to be able to get the normal status again.
Dial Tone is sent to a customer or operator to indicate that the receiving end is ready to receive dial pulses or DTMF signals. It is used in all types of dial offices when the customer’s or operator’s dials produce dial pulses. Normally, dial tone means that the entire wanted number may be dialed. However, there are some cases where the calling party must await a second dial tone or where an operator, after dialing an initial group of digits, must wait for a second dial tone before the rest of the number can be dialed. Some dialing switchboards are arranged to permit listening for dial tone between certain digits.
Dial Tone is 350 Hz and 440 Hz held steady at -13 dBm0/frequency.
Busy Tone:busy signal (busy tone / engaged tone) in telephony is an audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. In other case the receiving party is already busy, on completion of your dialed number.
Line Busy Tone:
The Line Busy Tone indicates that the called customer’s line has been reached but that it is busy, being rung, or on permanent signal. When an operator applies a line busy signal, it is sometimes called a busy-back tone.
Line Busy Tone is a Low Tone that is on and off every .5 seconds.
Receiver Off-Hook Tone:
The Receiver Off-Hook Tone causes off-hook customers to replace the receiver on-hook on a permanent signal call and to signal a non-PBX off-hook line when a switchboard operator operates the ringing key.
Receiver Off-Hook Tone is 1400 Hz, 2060 Hz, 2450 Hz, and 2600 Hz at 0 dBm0/frequency on and off every .1 second. On some older space division switching systems, Receiver Off-Hook was 1400 Hz, 2060 Hz, 2450 Hz, and 2600 Hz at +5 VU on and off every .1 second. On a No. 5 ESS, this continues for 30 seconds and on a No. 2/2B ESS, this continues for 40 seconds. On some other AT&T switches, there are two iterations of 50 seconds each.
There are many other Special Purpose Tones, you can search for them on net. such as, Call Waiting Tone, Confirmation Tone, Permanent Signal etc.
Dual-tone multi-frequency signaling:
(DTMF) is used for telecommunication signaling over analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center. The version of DTMF that is used in push-button telephones for tone dialing is known as Touch-Tone. It was developed by Western Electric and first used by the Beell System in commerce, using that name as a registered trademark. DTMF is standardized by ITU-T Recommendation Q.23
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