Additional information available:

ANSWERDIALDIRECTORYEXITFACSIMILEHANGUP
HELPHOLDMAILREJECTUNHOLD

CharactersSwitch hook

The following table describes all of the special characters accepted by
PHONE, and shows the differences between command input and conversation
input.

CHARACTER     AS PART OF COMMAND            AS PART OF CONVERSATION

delete        delete previous character     same
line feed     ignored                       delete previous word
return        end of command                start new line in viewport
tab           ignored                       tab to next tab stop
CTRL/G        ignored                       ring the bell
CTRL/L        ignored                       clear the viewport
CTRL/Q        negate a CTRL/S               same
CTRL/S        freeze the screen             same
CTRL/U        clear current command         clear current viewport line
CTRL/W        refresh the entire screen     same
CTRL/Z        equivalent to EXIT            equivalent to HANGUP

The switch hook character is used to signal that you are about to enter
a command.  Normally, all text typed is considered part of the conversation.
However, when you type a switch hook, all characters up to the next carriage
return (or switch hook) are treated as a command.

The switch hook is optional if you are not carrying on a conversation
when you enter the command.

The switch hook character is always displayed in column 1 of line 2.
The default character is the percent sign (%).