 Looks like an Inq correspondent out at Expocomm Argentina 2005 dug up a rather interesting little device, the Ateus VoiceBlue VoIP to GSM gateway. Think of it like a four-channel VoIP to cellular Junxion box—a device you’d drop voice over IP calls into the Internet with over your cellular (GSM) connection(s).
 Brilliant. At €1,500 (about $1,800 US) the price isn’t exactly for the faint of heart, and unless you’re a business with a mobile workforce that’s burning through a lot of overage minutes you probably won’t be able to absorb the initial cost very quickly, but it’s nice to know you could have one if you wanted it, innit?
The approach is pure genius: traditional VOIP gateways hook up to the PSTN (public switched telephone network) land lines. But what if a call from company branch “x” arriving from the VOIP cloud must end in a GSM mobile phone? Traditionally, the call is then routed using a VOIP-to-POTS gateway to the cellular phone network… at an additional fixed-to-mobile call rate charged by the PSTN operator! This isn’t nice. So what the guys at 2N Telekomunikace (a Czech company) did was pure genius… they developed a VOIP to analogue gateway that instead of offering a RJ11 to be plugged to a fixed phone line, is hooked to a GSM phone interface.
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