Secure call DTMF signaling

A method and system for secure call Dual-Tone Multi-Frequency (DTMF) signaling includes entering dial string of a telephone number of a destination device, assigning the dial string to a predefined string having a total length that is greater than the dial string such that there will be at least one...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Lundsgaard, Soren K, Kuhlman, Douglas A, Liu, Yi-Cheng, Promenzio, Edgardo L, Danieluk, Jorge R. Lopez
Format:	Patent
Sprache:	eng
Online-Zugang:	Volltext bestellen
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