Microphone; speaker; IP (Internet protocol) phone based hands-free device with integrated microphone and speaker for use at multipoint conferences; hands-free device with integrated microphone and speaker for use with telephone for electronic conferencing on computer networks; hands-free device with integrated microphone and speaker for video calling systems; hands-free device with integrated microphone and speaker for telephones; direction-based automatic volume adjuster for hands-free phones; hands-free kit for telephones; telecommunication machines and apparatus for use in computer networks; electronic microphone speaker system for use in computer networks; telecommunication device used for transmitting and receiving data, sounds, and images to a network; echo cancelling device (electronic component for hands-free phones); noise-reduction device (electronic component for hands-free phones); telecommunication machine and apparatus; computer program