Major Function 1. VoIP(SIP),GSM conversion. 2. VoIP(SIP),UMTS conversion for all world 3. 50 sets of LAN --&gt MOBILE routes setting,50 sets of MOBILE --&gt LAN routes setting. -Support one stage diaing -Support free mode-two stage dialing and assigned mode-one stage dialing 4. Voice response for setting and status(dial in from mobile). 5. For call termination (VoIP to GSM/UMTS ) and origination ( GSM/UMTS to VoIP). 6. Standard SIP(RFC2543,RFC3261) protocol,Communicates with other gateway or PC 7. Receive SMS and Send SMS 8. Allows your program Send/receive SMS with AT Command 9. Call Back feature 10. 11. 12. All functions can be set on web. Provide CDR 1 year warranty Specification Protocols:SIP (RFC2543,RFC3261) TCP/IP:IP/TCP/UDP/RTP/RTCP/,CMP/ARP/RARP/SNTP,DHCP/DNS Client,IEEE802.1P/Q,ToS/DiffServ,NAT Traversal,STUN,uPnP,IP Assignment,Static IP,DHCP,PPPoE Codec:G.711 u-Law,G.711 a-Law,G.729A,G.729A/B Voice Quality,VAD,CNG,AEC,LEC,Packet loss 3G Frequecny: U Version:2G 850,900,1800,1900MHz,3G 850,2100 MHz A Version:2G 850,900,1800,1900MHz,3G 850,1900 MHz G Version:2G 850,900,1800,1900MHz,3G 800/850/900/1900/2100HMZ Solution suggest 1. If you need the solution for 32 GSM ports,1 SIM per GSM port, you can buy MV-3732*1,(option:SBK-32*1,SS-128) 2. If you need the solution for 32 GSM ports,4 SIMs per GSM port, you can buy MV-3732*1,SBK-128*1,SS-128 3. If you need the solution for 64 GSM ports,4 SIMs per GSM port, you can buy MV-3732*2,SBK-128*2,SS-256