Key Features Support 4G LTE 16 Channles 16 sim cards Outbound call from VoIP Inbound call from PLMN VoLTE HD Voice High Concurrency Capability Quadruple SIMs and Intelligent Switching Hot Plug Bulk SMS Auto obtain SIM Number Remote management IMEI Changable Relay encryption and Saving bandwidth Software Features VoIP Protocols：SIP V2, H.323 V4 Audio Codecs：g711(alaw/ulaw), g729, g723.1 DTMF format：SIP INFO, RFC2833, Inband Packet Loss Concealment Programmable Jitter Buffer：Fixed, Dynamic, Adaptive Network Connection：DHCP, PPPOE, Static IP STUN Server Support English, Chinese Support Signaling encryption Support media encryption Support Media NAT Traversal Support Remote control Hardware Features Channels：16 SIM Slots：16 Power Adapter：DC 12V/4A CPU：ARM11/700MHz RAM：128M Flash：8M Max power consumption：30W Weight: 3KG (Including AC/DC Adapter) Size: 420mm (L) x 230mm (W) x 160mm (H) Operating Temperature：0-45℃ Working Humidity：10％－90％non condensation