Wireless conference telephone system or a corresponding audio system, the system comprising of at least one audio unit (B1-B3) having at least one microphone and/or at least one speaker (SPK1-SPK4), an audio control unit (UI1), and a power source, at least one signal source unit (C1), and at least one operation control unit with which the user can control the operation of the wireless control unit coupled to the audio unit(s) over a digital personal area network standard, such as Bluetooth radio standard, capable of forming said connection. The operation control unit communicates with the audio unit(s) by using a wireless protocol, such as WAP, and the operation control unit has a user interface so that the user controls the operation of the system over a user interface, such as WML, operating over the wireless protocol.

 
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> Fault characterization using information indicative of echo

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