You can use the Phone utility (PHONE) to communicate with other
    users by simulating some of the features of real telephone
    communications. To invoke the Phone utility, enter the PHONE
    command at the DCL command prompt using the following format:

    Format

      PHONE [/qualifier] [phone-command]

    To exit, enter the EXIT command. The system returnes you to the
    DCL command prompt. If you are in the Phone utility but are not
    currently engaged in a conversation, you can press Ctrl/Z to
    exit.

    The HANGUP command is used to hang up your own phone. It
    disconnects all current links but leaves you in the Phone
    utility. Pressing Ctrl/Z during a conversation is equivalent
    to entering the HANGUP command.

    Phone can be used only on video terminals with direct cursor
    positioning, such as the Digital VT52, VT100, VT200, and VT300
    series terminals. The Phone utility uses the SCOPE terminal
    characteristic to determine if it can support a terminal.