A : a normally major channel or passage (like a chute or shaft) b : a circuit between two telephone exchanges for making connections between subscribers broadly : a usually electronic path in excess of which information and facts is transmitted (as involving Personal computer systems) This icon serves as http://buzzgram.de/die-evolution-der-kommunikation-eine-einfuhrung-in-sip-trunking-voip-handys-softphones-und-voip-telefonanlagen/