Mu nganda zubaka, itumanaho ryiza rirakomeye.Ikintu cyingenzi cyiyi sisitemu nitelefone itagira ikirerena terefone yihutirwa.Iyi terefone nziza yubatswe kugirango ihangane nikirere gikaze, itume itumanaho ridahungabana ndetse no mu mvura nyinshi, shelegi cyangwa ubushyuhe bukabije, kandi bigatuma abakozi bo mu bwubatsi bavugana ku gihe mu gihe byihutirwa.