1) 8 port(8 SIM Card) wireless (GSM or CDMA) VOIP gateway. 2)support ... VoIP network with GSM networks. Function: 1,Support 4/8 Channels 850/900/1800/1900MHz Quad-band GSM ... of Channels4GSM8GSMFrequency850/900/1800/1900MHzCall Control ProtocolsSIPVoice CodecsG.729A, G.723.1, G.711 a/ulawNetwork ProtocolsIPv4, TCP, UDP, PPPoE, ... CDMA/WCDMA ,you need order SinoV-X500 type. 4 Port Wireless GSM Voip Gateway