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In computer science and telecommunications, calling is:

  1. Any attempt to set up a communications circuit.
  2. A unit of traffic measurement.
  3. The actions performed by a call originator.
  4. The operations required to establish, maintain, and release a connection.
  5. To use a connection between two stations.
  6. The action of bringing a computer program, subroutine, or variable into effect; usually by specifying the entry conditions and the entry point. In programming languages (such as C and C++) before subroutines and variables can be called, they must be declared.