... SIP, H.323, MGCP, IAX2, and net2phone protocol 2, Supports Skype, MSN and QQ software 3, USB2.0 port 4, 16 ... ) feature10, Implement "real-time" verification11, Compatible with PC's Internet phone application software12, Provides ringer generation for PC to PC call ... through existing IP phone applications13, Optional ITSP application software with credit for PC to ...