Support kinds of voice coding, including G.711 (alaw and u-law) G.723.1 (5.3K/6.3K) G.726 (40K/32K/24K/16K), G.729A/B, and iLBC; Support incoming call on show, restricting, and holding, disconnection, call transfer, call divert, DTMF, dialing project, etc; Support conference call; Support passing through and T38 fax, voice restrain and jerquers, CNG, echo restrains (G.168), AGC, and DIGEST using MD5 and MD5-sess; Support layer 2 (802.1Q VLAN, 802.1p) and layer 3 (QoS, DiffServ, ToS); Support NAT auto- penetrating, no need to modify the setting of the NAT; Support configuration files by inside IVR equipment, Web browser, or TFTP and HTTP Center Server; Support upgrading encrypts configuration files by TFTP or HTTP; Microminiaturize and legerity design (size as a wallet), a Voice gateway that convenient for schlepping