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There are two GSM Gateway models with VoxStack series GSM Gateway, the VS-GW1200-4G and VS-GW1600. The Modular Design GSM Gateways are ranging from 4 up to 20 GSM channels, developed for interconnecting a wide selection of codecs and signaling protocol, including G.711A, G.711U, G.729, G.722, G.726, iLBC, GSM & SIP, to the GSM cellular networks to quickly reduce telecommunication expenses and maximize cost-savings. With the unique design of the VoxStack Gateway, it can support hot-swap for both SIM cards and GSM gateway modules. Users can simply add or remove the modules for hardware expansion or exchange. Each GSM gateway module runs an independent asterisk system inside.
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