Call duration

In telecommunications, the term call duration has the following meanings:


 * 1) In telephone systems, the time between (a) the instant a circuit, i.e., off-hook condition at each end, is established between the call originator and the call receiver and (b) the instant the call originator or the call receiver terminates the call.
 * 2) In data transmission, the duration of the information transfer phase of an information transfer transaction.

Source: from Federal Standard 1037C