... ports, 2 USB (2.0) host ports, 2.5mm headset jack caller ID, call waiting, hold, transfer, for-ward, 1) SIP ... ports, 2 USB (2.0) host ports, 2.5mm headset jack 3)Advanced Digital Signal Processing (DSP), Silence suppression, VAD, CNG ... , intercom, AES encryption. 300 degree voip video phone with USB port