Speakerphones, full-duplex speakerphones, videophones, audio-conference phones, web conferencing accessories, namely, devices for hands-free computer audio communications; web conference phones, acoustic echo cancellers, telephone line echo cancellers, cellular phone accessories, namely, devices for hands-free use of mobile phones; wired and wireless audio and video intercom terminals, VoIP phones, audio noise suppressors for microphone inputs and loudspeaker outputs