Sell VOIP Analog Telephone Adaptor (China (Mainland))

1. Voice communications via internet or LAN connection 2. Router mode to support both voice and data communications via the same broadband connection 3. Support h.323 v.4 VOIP protocol 4. Support sip v.2 VOIP protocol 5. Support tcp/udp/IP, rtp/rtcp, HTTP, arp/rarp, icmp, dns, dhcp, ntp, tftp protocols 6. Support voice codecs: G.711 a-law, g.711 m-law, g.726, g.729 a/b, g.723.1, gsm-fr 7. Dynamic negotiation of codec selection and voice payload length 8. Automated provisioning via HTTP 9. Configurable via PC web browser, telnet, rs-232 commands (optional), or built-in phone menu 10. Dual ethernet ports for modem and PC interface without a hub or switch 11. Network connection via dhcp, pppoe, or fixed IP 12. Nat transversal via stun server, port forwarding, or proprietary vpn proxy server 13. Online firmware upgrade manually or automatically 14. Support port forward mode 15.2 ports