Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1993-04-30
1994-11-29
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Substation originated
379359, 379377, 379386, H04M 150
Patent
active
053696972
ABSTRACT:
Dual tone multifrequency (DTMF) signals are automatically generated by a telecommunications device after a telephone number is called. The signals generated to call the telephone number are determined by a manually operated switch indicating pulse code signal generation or dual tone multifrequency signal generation. It is determined that the telephone number has been dialed by detecting a ring-back signal, voice frequency signals, DTMF signals, or data stream signals. Alternatively, if a predetermined period of time, such as ten seconds, passes without the user pressing a number on the keypad, it may be assumed that the telephone number has been dialed. Upon detecting one of these signals or the passage of time, the telecommunications device is controlled to generate only dual tone multifrequency signals for communication with automated services, such as voicemail, telephone banking, reservation systems, etc.
REFERENCES:
patent: 3988549 (1976-10-01), Merlin et al.
patent: 4233475 (1980-11-01), Roche
patent: 4922516 (1990-05-01), Butler et al.
patent: 4998276 (1991-03-01), Hasegawa
Gergacz David S.
Hemmings David F.
Murray John P.
Boston Technology, Inc.
Dwyer James L.
Shehata M. W.
LandOfFree
Method and apparatus for automatically switching between pulse c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for automatically switching between pulse c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for automatically switching between pulse c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-79228