[ Computer hardware; computer peripherals; communication hardware for voice communication via computers; communication hardware for use in connecting telephones to computers; ] computer telephony software; computer software for providing voice communication services via computers; computer telephony integration (CTI) software to enable computers to act as call centers; computer software that enables enhanced telephone activities such as voicemail, caller attendant, call forwarding, call transfer, voicemail forwarding by email, and conferencing to be performed via computers; computer software that enables desktop telephone activities such as [ click to call, ] search, and directory access to be performed via computers; computer software that allows subscribers to utilize public switched telephone network (PSTN) and voice over Internet protocol (VOIP) services; [ converters; user manuals and instruction books in electronic form distributed with the foregoing; and user manuals and instruction books sold as a unit therewith ]