Ejointech GoIP 16 Ports 4G VoIP GSM Gateway (IMEI Changeable, 512 SIM Card, SIP & H.323, VPN PPTP) SMS Voice VOIP Gateway[ACOM516L-512]

ACOM516L-512 4G VoIP Gateway VoIP Gateway is a multi-functional and high performance product, which convert GSM network to VoIP.It supports mutiple concurrent lines.It is widely used in call center, enterprise communication,sim active, sms verify code, sms marketing, automated appointment reminder service,sim recharge and corporate sms,veryfication sms,wallet payment system etc.ACOM56L-512 series is a device which uses Internet Protocols to transmit and receive voice communications and sms service. Specifications Model ACOM516L-512 Description 16 Ports 512 Sim Slots 4G LTE Voip Gateway Frequency Bands Global Network Compatible SIP Specification SIP/2.0 RFC3261Session Timer RFC4028STUN Network Protocols DHCP/PPPoE/VPN(PPTP/Open VPN)NTP Telnet/HTTP/FTP/TFTPEncryption:Ejoin,VOS2000,RC4,XOP.Base64 Telephone Hot-line call ,Dial plan, Speed dial, Phone book,CDR, LCR, White/Black list Telephony Signaling DTMF tone detection/generationDTMF relay: in-band, RFC 2833 a