4 FXO Ports - SIP/ H.323 version 4 Audio codecs: - G.711 (a-law/µ-law) (64 kbps) - G.729a (8kbps) - G.723.1 (5.3/6.4 kbps) - Clearmode - GSM (Optional) - FAX Support - up to G3 FAX, using T.38 - Modem Support - up to V.90, using G.711 - Up to 8 VoIP channels Analog: - 600R, 900R or CTR-21 line impedance LAN Interfaces: - 2 RJ-45s, 10 BaseT / 100 BaseTX, full / half duplex