... H.323, MGCP, IAX2, and net2phone protocol 2, Supports Skype, MSN and QQ software 3, USB2.0 port 4 ... HID (Human Interface Device) feature7, Plug and play to install USB driver8, No driver needed ... existing IP phone applications13, Optional ITSP application software with credit for PC to phone connection 14 ... , ALED to indicate power and linking status 15, Adjustable volume for handset ...