internet telephone for allowing the user of a single phone line to answer phone calls while connected to the internet

Mobile operating systems

TELEPHONES; ANSWERING MACHINES; PORTABLE TELEPHONES; PORTABLE TELECOMMUNICATION HEAD SETS; HEADPHONES; SOFTWARE AND COMPUTER OPERATING PROGRAMS FOR USE IN TELECOMMUNICATIONS, NAMELY, RING TONE SOFTWARE; SEMI CONDUCTORS; RECORDED OR TELE-RECORDED TAPE AND MAGNETIC TELEPHONE CARDS CONTAINING MESSAGES, GREETINGS, INSTRUCTIONS, AND THE LIKE