A—telephone operator； B—extension telephone
C—direct dial telephone； D—urgent call
E—wake-up call； F—long-distance call
G—local call ；H—sub telephone
I—international radio telephone ；J—outside line
K—hold up； L—cancellation fee
M—minimum charge； N—person to person call
O—gets through ；P—courtesy phone

（）分机；（）外线

A—telephone operator； B—extension telephone
C—direct dial telephone； D—urgent call
E—wake-up call； F—long-distance call
G—local call ；H—sub telephone
I—international radio telephone ；J—outside line
K—hold up； L—cancellation fee
M—minimum charge； N—person to person call
O—gets through ；P—courtesy phone