Methods and apparatus for enabling simultaneous transmission of voice and data signals over a single subscriber line. Signals are time division multiplexed preferably using an ISDN access format such as the Basic Access or Primary Rate formats, but are treated separately at the exchange. Subscriber equipment...http://www.google.es/patents/US6243377?utm_source=gb-gplus-sharePatente US6243377 - System for providing simultaneous voice and data transmission
System for providing simultaneous voice and data transmission
