USB network phone function ? USB port,hot insert, no driver ? no need sound card and power support, clear tone ? no need to take headphone and mic for long time. ? decrease the noice and maintain the phone quality USB network phone spec ? support PC-to-PC and PC-to-phone ? USB port 2.0/1.1 ? no need sound card ? no need external power ? low down the noice ? compatible with H.323, MGCP, SIP ? full-duplex communication ? button sound and in call sound ? support skype platform and quick dail ? read and operate skype friends, dail, call record, use phonebook to dail