Call from voip to gsm or gsm to voip, bulk sms, auto check balance and recharge, remote control, outbound, call from voip, inbound call from gsm, remote management. gsm channels:32 ports
power adapter: dc12v/4.5acpu: arm11/700mhzram: 128mflash: 8m, gsm frequency:850/900/1800/1900mhz, max power consumption: 38w, net weight: 1.7kg, size: 36.2*21*6.5cm, operating temperature: 0-45°c, 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 signaling encryption, support media encryption, support media nat traversal, support remote control