The Jarti VP553 is a voice-communication terminal based on wide band and which operates independently of a PC. The VP553 is easy to use and doesn't require any special training. After setup, the unit operates identically to a normal telephone. The VP553 also has NAT functions, allowing the connection of several PC's to the Internet simultaneously. Use of this unit's VOIP functions requires a VoIP service provider. Voice features: 1) Codec: G.711A/u, G.7231 high/low, G.729 2) G.168 echo cancel 3) Voice gain setting 4) Jitter buffer 5) Auto latency recover 6) VAD 7) CNG 8) RFC2833 DTFM relay 9) Supports H323 and SIP synchronously H323 features: 1) H323v4 2) DNS name of GK 3) H323 call forward 4) H323 fast start 5) Early H245 6) H245 tunneling 7) H245 multiplex 8) H245 DTMF/Q931 DTMF facility 9) Q931 signaling port setting 10) Dual GK support 11) NAT transverse, CITRON 12) NAT transverse, AVS 13) Fast start with early media channel voice 14) Peer to Peer H323 call SIP Features: 1) RFC3261, RFC3262, RFC3666, RFC2543 2) Proxy and register 3) SIP domain 4) Server authentication: none, basic, MD5 5) DNS name of SIP server 6) SIP signaling port setting 7) NAT transverse, STUN 8) NAT transverse, SIP Express router 9) Pubic Server / Private server: can connect to ISP and Private SIP server at same time 10) Dual public server 11) SIP INFO for DTMF, interoperable with CISCO SIP device 12) Individual password for each number 13) SIP call forward/transfer/holding/waiting 14) Peer to peer SIP call Network features: 1) WAN/LAN port with router or bridge mode 2) Basic NAT and NAPT 3) NAT ALG 4) Under bridge mode, access internet by using NAT through PPPoE 5) PPPoE for xDSL , automatic keep alive 6) DHCP Client on WAN 7) DHCP server on LAN 8) DNS client with 2 servers IP 9) DNS relay on LAN 10) Auto configuration on LAN for IP and DHCP server 11) SNTP 12) 802.1P QOS 13) Firewall 14) Network utilities : ping, trace route, telnet client Call control features: 1) Flexible dial map 2) Fix length 3) End with # 4) Dial map table 5) Dial with time out 6) Call routing table for phone book 7) Multiple phone Nos. for same phone 8) Public No. and private No. for phone 9) HOTLINE service: Pick up phone , dial immediately 10) Black list for rejecting authenticated call 11) Empty calling No. reject service 12) Limit dialing out No. list 13) Do not disturb 14) Caller ID display 15) Call forward without condition or busy 16) 3 way talking service 17) Dial out authentication