*Support H.323 V4,SIP v2.0 (RFC 3261),MGCP (RFC 3435) *Codec: G. 711,G.723.1,G.726 and G.729A/B *Built-in Router function *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