Hangs up your phone. This disconnects all current links - the
    current conversation, anyone you have on hold, and anyone who has
    you on hold. The HANGUP command does not cause an exit from the
    Phone utility. (Compare this command with the EXIT command.)

    Pressing Ctrl/Z during a conversation is equivalent to
    entering the HANGUP command. (Pressing Ctrl/Z when there is no
    conversation is equivalent to entering the EXIT command.)

    Format

      HANGUP

1  –  Example

  %DIAL PETERS
     .
     .
     .
  %HANGUP
  %DIAL FENTON
     .
     .
     .
  %EXIT
  $

      This example illustrates the difference between HANGUP and
      EXIT commands. At the first Phone prompt, Peters is dialed.
      The phone connection to Peters is terminated with the HANGUP
      command, but the user is still in the Phone utility. The phone
      connection to Fenton is terminated with the EXIT command, which
      causes an exit from Phone and a return to DCL command level.
      (Note that Ctrl/Z could have been used instead of the HANGUP
      command.)