A telephone device 100, integrated with a telephone or as a telephone add-on device, improves receipt and processing of network information such as Caller ID from conventional telephone networks. A comparator 103 decodes incoming Frequency Shifted Keying (FSK) signals by transforming transform the FSK...http://www.google.es/patents/US6226369?utm_source=gb-gplus-sharePatente US6226369 - Telephone with novel FSK decoding means, simultaneous off-hook caller ID reception means, and set of configurable function key means
Telephone with novel FSK decoding means, simultaneous off-hook caller ID ...
