["MV-374 is a 4 channels VoIP GSM/UMTS/LTE Gateway for call termination (VoIP to GSM/UMTS/LTE ) and origination (GSM/UMTS/LTE to VoIP). It is SIP based and compatible with Asterisk,Trixbox,3CX,SIP Proxy Server,VoipBuster. It can enable to make 4 calls simultaneously from IP phones to GSM/UMTS/LTE networks and GSM/UMTS/LTE networks to IP phone. Connect with PORTech GSM Gateway via internet SIM cards no longer need to be installed in GSM Gateway anymore; You can deploy your GSM Gateway in different locations. Centralize and supervise all SIMs in one place", "VoIP(SIP),UMTS/LTE conversion.(MV-370) for all world 50 sets of LAN --> MOBILE routes setting,50 sets of MOBILE --> LAN routes setting", "-Support one stage dialing -Support assigned mode and free mode-two stage dialing", "Voice response for setting and status(dial in from mobile)", "For call termination (VoIP to GSM/UMTS/LTE) and origination (GSM/UMTS/LTE to VoIP)", "Standard SIP(RFC2543,RFC3261) protocol,Communicates with other gateway or PC", "Receive SMS and Send SMS", "Allows your program Send/receive SMS with AT Command", "Call back feature", "All functions can be set on web", "Provide CDR", "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", "4G LTE version (Global) LTE FDD: B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28 LTE TDD: B38/B39/B40/B41 WCDMA: B1/B2/B4/B5/B6/B8/B19 GSM: B2/B3/B5/B8"]