Acoustic receivers for telephonic communication with computers; computer apparatus; computer hardware; computer interfaces; computer networks; computer peripheral devices; computer program discs; computer software; computer systems; discs bearing computer programs; input devices for computers; telecommunications apparatus for transmitting data for use with computers; computer programs for use in telecommunications; digital telecommunications apparatus; telecommunications devices; computer apparatus for recording telephone calls; computer apparatus for the management of telephone calls; digital telephone sets; electronic telephones; telephone apparatus; telephone call management apparatus; telephone call management systems; telephone handsets