SI-400 VoIP Gateway is an internet based voice network phone terminal. It adopts multiple voice control protocols and voice compression coding methods to directly convert analog voice into IP packet for internet transport, thus effectively using the existing bandwidth to provide PSTN quality voice service.
SI-400 Gateway supports SIP protocols,Support Bridge and Router model.Support 4 public sip server, offers Two Ethernet interface and is compatible with various softswitch systems and VoIP voice gateways to provide broadband IP voice service.
 Features
- Support SIP 2.0 (RFC3261) and correlative RFCs
- Codec:G.711A/u, G.729
- Echo cancellation: Support G.168, and Hands-free can support 96ms, Hand free Speaker Phone
- Support Voice Gain Setting, VAD, CNG
- Full duplex hands-free speakerphone
- NAT transverse:support STUN client
- SIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer/ IP call
- DTMF:Support SIP info, DTMF Relay, RFC2833
- SIP application: support Call forward/transfer/holding/waiting
- Call control features: Flexible dial map, Hotline, Empty calling reject, Black list for reject authenticated call, limit call, No disturb, Caller ID.
- Support three way conference call
- Support voice record, 240 seconds max or 3 record max, user-defined record prompt with 1 minute max
- Support Phonebook 500 records
- Incoming calls / Outgoing calls / Missing calls. Each support 100 records.
- Support conference and voice record on SIP server
- 8 kind of ring type
- English, Spanish, Czechoslovak alternative
Network Features
- WAN/LAN: Support Bridge and Router model
- Support basic NAT and NAPT
- Support PPPoE for xDSL
- Support DHCP Client on WAN
- Support DHCP Server on LAN
- Support VLAN (optional: voice vlan/data vlan)
- QoS with DiffServ
- Support DMZ
- Support VPN (L2TP/UDP TUNNEL)
- Support DNS Relay, SNTP Client, Firewall
- Network tools in telnet server: Including ping, trace route, telnet client
Maintenance and Management
- Web ,telnet and keypad management
- Management with different account right
- Upgrade firmware through POST mode
- Upgrade firmware through HTTP, FTP or TFTP.
- Telnet remote management./ Upload/download setting file
- Safe mode provide reliability
- Supoort Auto Provisioning (upgrade firmware or configuration file)
- Support Syslog
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VoIP Device 
