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  2. Disconnect tone - Wikipedia

    en.wikipedia.org/wiki/Disconnect_tone

    A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. [ 1 ] [ 2 ] Typically, the disconnect tone is a few cycles of the reorder , busy , or the off-hook tone (e.g. in US), or between five and fifteen seconds of the Number Unobtainable tone (e.g. in UK).

  3. Supervision (telephony) - Wikipedia

    en.wikipedia.org/wiki/Supervision_(telephony)

    The states are indicated by various electrical signals and electrical conditions depending on the type of circuit, the type of terminating equipment, and the type of intended service. Answer and disconnect supervision are functions of line signaling that convey circuit seizure and disconnect. Answer supervision indicates that a call has been ...

  4. On- and off-hook - Wikipedia

    en.wikipedia.org/wiki/On-_and_Off-hook

    The weight of the receiver depresses the spring-loaded switchhook thereby disconnecting the idle instrument (except its bell) from the telephone line. One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. Note: if on-hook pertains to one state, off-hook pertains to the other.

  5. Portal:Telephones/Selected audio - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones/Selected...

    A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. Typically, the disconnect tone is a few cycles of the reorder , busy , or the off-hook tone (e.g. in US), or between five and fifteen seconds of the Number Unobtainable tone (e.g. in UK).

  6. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.

  7. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    Please check your main telephone and extensions, then try your call again. Thank you." The message may be repeated, then followed by a loud, rasping off-hook tone intended to remain audible even if the handset is on the desktop instead of at the subscriber's ear. This tone is louder than the standard busy/fast busy signal.

  8. Signaling (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Signaling_(telecommunications)

    In the public switched telephone network (PSTN), in-band signaling is the exchange of call control information within the same physical channel, or within the same frequency band, that the message (the callers' voice) is using. An example is dual-tone multi-frequency signaling (DTMF), which is used on most telephone lines to customer premises.

  9. Permanent signal - Wikipedia

    en.wikipedia.org/wiki/Permanent_signal

    Permanent signal (PS) in American telephony terminology, or permanent loop in British usage, is a condition in which a POTS line is off-hook without connection for an extended period of time. [1] This is indicated in modern switches by the silent termination after the off-hook tone times out and the telephone exchange computer puts the ...