In telephony, the term on-hook has the following meanings:

1. The condition that exists when a telephone or other user instrument is not in use, i. In Telecommunication, telephony (təˈlɛfəni or teh-LEH-fuh-nee encompasses the general use of equipment to provide voice communication over distances specifically Basic principle A traditional landline telephone system also known as "plain old telephone service" (POTS, commonly handles both signaling and audio information In Telecommunications, a user is a person organization or other entity that employs the services provided by a Telecommunication system or by an Information e. , when idle waiting for a call. Note: on-hook originally referred to the storage of an idle telephone receiver, i. e. , separate earpiece, on a switchhook. Headphones (also known as earphones, earbuds, stereophones, headsets) are a pair of small Loudspeakers or less commonly a single The weight of the receiver depresses the spring loaded switchhook thereby disconnecting the idle instrument (except its bell) from the telephone line. A telephone line or telephone circuit (or just line or circuit within the Industry) is a single-user circuit on a Telephone
2. One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. In Telecommunication, signalling (UK spelling or signaling (US spelling has the following meanings The use of signals for controlling communications 2600 Hz is the Frequency in Hertz (cycles per second that AT&T formerly put as a steady signal on any Long-distance Telephone An electrical connection between discrete points allows the flow of Electrons ( Electric current) Note: if on-hook pertains to one state, off-hook pertains to the other. In Telephony, the term off-hook has the following meanings The condition that exists when a Telephone or other user instrument is in
3. The idle state, i. e. , an open loop of a subscriber line or PBX user loop. In Telephony, the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the Demarcation point of the
4. An operating state of a communications link in which data transmission is disabled and a high impedance, or "open circuit", is presented to the link by the end instrument(s). In Telecommunication a data link is the means of connecting one location to another for the purpose of transmitting and receiving digital information Debt AIDS Trade in Africa (or DATA) is a Multinational non-government organization founded in January 2002 in London by U2 's In Telecommunications transmission is the process of sending propagating and receiving an analogue or digital information signal over a physical point-to-point or Electrical impedance, or simply impedance, describes a measure of opposition to a sinusoidal Alternating current (AC An electronic circuit is a closed path formed by the interconnection of Electronic components through which an Electric current can flow In Telecommunications an end instrument is a technical term for the piece of equipment connected to the wires at the end of a telecommunications link Note: during the on-hook condition, the link is responsive to ringing signals.

The act of going on-hook is also referred to as releasing the line or channel, and may initiate the process of Clearing (telecommunications). Clearing, in Telecommunications means A Sequence of events used to disconnect a call and return to the ready state

See also disconnect supervision. Disconnect supervision is a term in Telephony describing signaling between the Telephone exchange and a connected party used to indicate that the connected call is

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