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- Dual-tone multi-frequency - Dual-tone multi-frequency (DTMF) signaling is used for telephone signaling over the line in the voice-frequency band to the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch-Tone, and is standardised by ITU-T Recommendation Q.
- Off-hook tone - The off-hook tone (also receiver off-hook tone or off-hook warning) is a telephony signal used to alert a user that the telephone has been accidentally left off-hook for an extended period, effectively disabling the telephone line. See permanent signal.
- Ringback tone - A Ring-back Tone (RBT), or Audible Ringing Tone or Ring-back Signal, is the audible ringing that is heard on the telephone line by the calling party after dialing and prior to the call being answered at the receiving end. This tone assures the calling party that a ringing signal is being sent on the ...
- Dial tone - A dial tone (known in the British Isles as a dialling tone) is a telephony signal used to indicate that the telephone exchange is working, has recognized an off-hook, and is ready to accept a call. The tone stops when the first numeral is dialed.
- Special information tone - In telephony, the special information tone is actually a series of three audio tones, which indicate that a telephone call cannot be completed. This series, consisting of a low, medium, and high tone, is used nearly everywhere in the North American Numbering Plan, and is an important type of call progress tone.