Modularized design: 8, 16, 24 ports

Single Number / Account for multiple ports

Caller ID Delivery & Detection

Smart VoIP call Dialing Book

AC termination Impedance: 600/900OHM & complex impedance

Answer Supervision for Polarity Reversal Detection & Voice detection

NAT traversal

Smart-QoS Guaranteed

Call Hunting Facility

Voice channels status display

Pulse Dial support

Flash Detection and Generation Program

Voice Codec: G.711(A-law /μ-law), G.729 AB, G.723 (6.3 Kbps / 5.3Kbps)

FAX support : T.30 / T.38

Echo Cancellation: G.165/G168

FXO Caller ID detection : DTMF and FSK (Optional) FXO hang up detection / anti-seized : Tone Learning Automatically / Manual Tone Learning (Optional)

Support Battery Reverse Detection & Voice Detection

FXO answer delay time: Support delay 0 8000ms to answer

Adjustable AC Termination Impedance: 600/900OHM & complex Impedance

Failsafe Mechanism (FXS relay to FXO): Power failed bypass support/Internet Failed by pass(Optional))

12K Hz and 16K Hz Metering (Customized)

H.323 v2/v3/v4 and SIP (RFC 3261), SDP (RFC 2327), Symmetric RTP, STUN (RFC3489), ENUM (RFC 2916), RTP Payload for DTMF Digits (RFC2833), Outbound Proxy Support

LAN :Support Virtual Server, DHCP Server

WAN: Support PPPoE client, DHCP client, Fix IP Address, DDNS client

Providing build-in NAT router function

Smart QoS: Guarantee the voice bandwidth

IP TOS (IP Precedence)/DiffServ

Voice channels status display

Direct Dialing Mode: peer to peer call (support IP Address Call or Domain Name Call)

Hot-Line Support