H.323,SIP (RFC3261) compliance
Web Setting and Management
IVR Voice configuration
Built-in NAT/IP sharing function
Basic PBX function (Private branch exchange)
Concentrated Network Management Systems(NMS)
Peer-to-Peer mode (non-Gatekeeper)
Line hunting 
32 RJ-11 FXS ports or 32 RJ-11 FXO ports
E.164 (Telephone Number Plan)
DTMF dialing
PPPoE connection
DTMF detection/generation
FSK and DTMF Caller ID
Remote configuration/reset via Telnet
LAN interface : two RJ-45 connector of 10/100 Base-T
Microsoft Netmeeting v3.0 compatible
Support static IP and DHCP
Built-in DHCP Server function
QoS by ToS (Type Of Service)
SNTP (Simple Network Time Protocol)
Bell signal
Polarity reversal
Antenna socket (FME)
IP usage switch
Working state indicator
Signal Strength indicator 

Function
(1) Supply two set extension to connect
(2) Incoming call display, and hide caller number(CID)
(3) Set local code, IP access code and special number;
(4) Set limiting to dial national long distance call mobile
(5) Phone call and local call?set using IP or not
(6) Lock phone and telecom operator
(7) Lock card automatically lock card with random PIN code or fixed PIN code.
(8 )32 ports with 32 SIM
(9 ) IMEI changeable
(10) Following me function,GSM to VoIP and VoIP to GSM