oduct information "Portech GSM/UMTS - VoIP Gateway 8x SIM / 1x LAN MV-378G-3G"Major Function 1. VoIP(SIP),GSM conversion. 2. VoIP(SIP),UMTS conversion for all world  3. 

50 sets of LAN --> MOBILE routes setting,50 sets of MOBILE --> 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