HP LaserJet 3150 All-in-One Printer series - Manual (Page 111)

EN Setting send fax options 109
Special dialing symbols options
The following table shows which dialing symbols can be entered into
a fax number using the procedure on the previous page.
Choice in Menu Symbol
in fax
number
Does this
Dial * * Dials a *.
Detect dial tone D Detects a dial tone in the dialing sequence.
Tone dial T Selects tone dialing.
Error correction E Disables error correction mode.
Fax speed Д, О, or 'I Chooses the maximum transmission speed.
Charge code C or $ Stores a charge code or pauses the dialing
sequence to allow you to enter a charge
code.
Hook flash ! Performs an automatic hook switch.