4/8 port Dual FXO/FXS Interface!
■ VS400/VS2400 have 4/8 port Dual FXO/FXS interface to connect between PBX and PSTN!

H.323 & SIP simultaneously support!
■ Deploy into any multimedia, interactive, or softswitch network with the leading call and session signaling protocol Life line support!
■ Automatic reroute the call via PSTN when VoIP failure with warning sound

Register up to 4 SIP Proxy or Gatekeeper simultaneously!
■ Flexible registration for different VoIP Route plan

Firewall, NAT, DHCP, PPPoE
■ Connect to any broadband or access provider, serve the whole network, and secure your data. User configurable IP services ensure every host is connected to the LAN. Auto-Provision Support!
■ Easy to remote configure/Upgrade via Provision System.

IP IVR Support!
■ Easy configuration by IVR(Wan and Lan IP settings) or Web-base GUI QoS guaranteed Voice package
■ Quality of Service ensure voice traffic gets high priority without shutting down your Ethernet LAN