[Product Information]

GOIP-4 GSM VoIP Gateway with External Antenna， 4 GSM Channels， up to 4 SIM Cards， Quad band， IMEI Changeable， Remote Access， VLAN / Qos， Easy to Install and Administrate， Auto Balance and Recharge.
GoIP is designed to work in conjunction with key phone systems and IP-PBX to provide GSM communications. The extensive compatibility of the GoIP makes it an ideal choice to be deployed in multi-vendor open architecture VoIP networks. GoIP is a great way to provide fast phone service deployment where regular PSTN line may not be readily available. GSM gateway also provides significant savings in usage， infrastructure and maintenance cost compared to conventional PSTN.
The GoIP features embedded SIP and H.323 protocols with flexible setting. The bi-directional password authentication (call authorization) and trust list authentication greatly minimize the risk of charge losses and the flexible routing function can meet special requirements of various call forwarding. In particular， the GoIP gateway supports multi device groups， with flexible setting of large GSM gateway groups with different channel numbers.
Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP V2)/ Single or Multiple Server Registrations/Two 10/100 Ethernet for WAN / LAN connections/GSM module for making GSM calls/ Speech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer/VLAN and QoS support/NAT Transversal and Router functions/ Voice prompts， HTTP Web， Auto Provision support for configuration and updates/ Highly stable embedded Linux operating system in high performance ARM 9 Processor
The Anysun GoIP series gateway is a broadband relay gateway newly developed ，The new product for seamless connection between the GSM network and VoIP network. When the mobile phone SIM card is installed in the GoIP， users can register the GSM phone to the VoIP softswitch system. Through the GoIP， users can realize the uplink and downlink calls between the GSM network and the VoIP network. In addition， the GoIP supports the transparent transmission of the caller number from the PSTN to the VoIP.