PROGRAMMABLE INTERMITTENT DTMF
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-May-31
When using a subscriber unit, it is possible to record the keystrokes for later use to redial. However, current subscriber unit merely record the sequence of key strokes without preserving any information regarding the interval between key strokes, or intervals before an additional dual tones multifrequency (DTMF) signals entered after a phone number was dialed. Currently if one tries the latter, an error message will be sent back to the subscriber use.