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. 
Major Function 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 diaing

-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 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 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 Application