• In computer programming, a statement or instruction which invokes a subroutine or another program. control of the program is temporarily transferred during this call, and subsequently returned after the subroutine or other program completes its task.
  • In communications, the establishing of a connection between stations.
  • In communications, the sending of a signal indicating the desire to establish a connection with another station.
  • In communications, the operations necessary to establish, maintain, and conclude a connection.

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