Internet telephony, or VoIP, is rapidly replacing the conventional kind. This year, for the first time, U.S. companies bought more new Internet-phone connections than standard lines. The major driver behind this change is cost. But VoIP isn't just a new t

【書誌情報】

ページ数：12ページ

サイズ：A4

商品番号：HBSP-R0509J

発行日：2005/9/1

登録日：2010/8/10