The Grug as he styles himself is a leading security expert specialising in Internettelephony or VOIP as it is often called.
格拉格把自己称作因特网电话方面——或者经常被简称为VOIP方面的顶级安全专家。
3
Some companies would have begun gently, with one or two; Cisco went for half a dozen, including optical networks, wireless equipment and internettelephony.