Systems, methods, protocols and apparatus for information exchange and synchronization using DTMF signaling over telephone communication channels are provided. Information is packetized and converted from one format, e.g., ASCII formatted data, to another format, e.g., BCD formatted data. The information...http://www.google.fr/patents/US6771751?utm_source=gb-gplus-shareBrevet US6771751 - Systems and methods for information exchange and synchronization using DTMF over telephone communication channels
Systems and methods for information exchange and synchronization using DTMF ...
