Software: * H.323 V4, SIP v2.0 (RFC 3261), MGCP (RFC 3435) * Codec: G. 711, G.723.1, G.726 and G.729A/B. * Hybrid echo cancellation G.168 (16 ms) * Auto switch between Fax and voice * DTMF tone detection/regeneration * Comfort Noise Generation (CNG) * User programmable Call Progress detection/generation * Voice Activity Detection (VAD) Facsimile protocol(option): T.38 * Real-time fax over IP * DTMF tone detection/regeneration HTTP Server * TFTP and flash memory for remote software download and upgrade * VLAN * SNMP * PPPOE * TFTP * HTTP Electric Spec: * Voltage:DC 9V~24V * Power adapter: DC 12V/800mA * Network intrface:1 RJ-45 Ethernet connectors * Tel intrface:4 RJ-11 Specification: * 150 * 110 * 28 mm (L * W * H)