System for increasing functionality through a predefined interface by use of an interconnection device to switch a non-standard echo cancellation processor onto the interface

A system for increasing functionality through a predefined interface, comprising:

• a first signal generator for generating and transmitting a predefined first set of signals to a predefined interface, said predefined first set of signals conforming to said predefined interface;
• a second signal generator for generating and transmitting a second set of signals which does not conform to said predefined interface;
• an interconnection device for receiving said second set of signals from said second signal generator and for receiving a subset of said predefined first set of signals from said first signal generator and for outputting to said predefined interface either said subset of said predefined first set of signals or said second set of signals
• a signal processor for performing acoustic echo cancellation;
• a switch connected between said single processor and said predefined interface such that said signals output from said interconnection device are transmitted through said predefined interface to said switch, and if said switch is closed, to said signal processor to perform acoustic echo cancellation on said signals.