Product Name: 16 Ports VoIP GSM Gateway, Cheapest Price GoIP GSM Gateway with 16 Channels Model NO.: DWG2000F-16G Type: Gateway Potocol: SIP/MGCP Channels: 1/4/8/16/32 Frequency: Quad-Band 850/900/1800/1900MHz Network Interface: 1wan, 3LAN, RJ45 Voice Codec: G.711.G.723.1.G.729A/B SMS API: Open SMS API Product Description 1, 16 ports VOIP GSM gateway, WCDMA gateway2.1/4/8/16 channels GSM network to VoIP3. Quad-band 850/900/1800/1900MHZ16channel GSM Gateway, CDMA/UMTS Gateway DWG2000-16G16channel GSM gateway DWG2000-16G, DWG2000 series VoIP GSM/CDMA/WCDMA Gateway is a new product that used to effectively implement the smooth transition from PSTN and GSM/CDMA/WCDMA to the VoIP network. With installing the mobile SIM Card in gateway, you can register the mobile phone on the VoIP Softswitch and also can be easily combined into arbitrary number of channels of Large Gateway Group. It's a cost-effective gateway suitable for small and medium size enterprises, system integrators and it also opens up new revenue generating opportunities for service providers.DWG2000-1GDWG2000-4GDWG2000-8G DWG2000-16GInterfacesGSM/CDMA/WCDMA SIM Ports1 ports4 ports8 ports 16 portsVoIP channels1 channel4 channels8 channels 16 channelsNetwork interface4*10/100M base-TX RJ45LED indicatorsPower, Run, signal strength indicator, LANVoiceVoice over packet CapabilitiesG.168 with 32, 64 or 128 ms tail lengthVoice CompressionG.711, G723.1, G.729 A/BDHCP Client/ServerNAT Router or Switched ModeNetwork ProtocolsTCP/UDP, RTP/RTCP, HTTP, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, TELNET, PPPOE, STUNQoSDiff Serve, TOS, 802.1P/Q VLAN taggingSignalingDTMF MethodRFC 2833, SIP Info, INBANDIP SignalingSIP(RFC 3261) over UDP,MGCPProvisioningTFTP, HTTPSecurityManagementWEB browser, Telnet, Voice promptPhysicalUniversal Power SupplyOutput:12VDC, input:100-240VAC/50HzEnvironmentalOperational:32-104°For 0-40°C Storage:14-140°For -10-60°C Humidity:10%-90%Dimensions195mm×133mm×35mm530mm×360mm×110mm530mm*360mm*110mm530mm*360mm*110mmWeight0.72kg6kg6kg6kgAdditional FeaturesCaller IDBellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CIDPolarity ReversalYesHomologationSafetyULComplianceFCC, CE