Why GSM?
Unlike the latest and greatest 3G/4G alphabet soup (e.g., EV-DO, UMTS, WiMAX, LTE), GSM is neither trendy nor glamorous. However, GSM is ubiquitous, it works, and it will not be going away any time soon. Most people with a cell phone have a GSM phone. According to the GSM Association, of the 3 billion wireless customers that roam the Earth, 82% are on GSM networks.
Why GAPfiller?
Set up a GAPfiller wireless network anywhere with an Internet connection without breaking the bank. The GAPfiller supports free local calls and SMS text messages and is compatible with billions of existing GSM handsets. Instead of piling up in landfills, discarded "non-smart" GSM phones can have a new lease on life. GAPfiller service requires only a SIP or IAX2 account with a Voice-over-IP (VoIP) provider and a license to operate in the GSM900 band. No complicated, time-consuming, and expensive vendor-specific integrations with GSM Base Station Controllers (BSCs) and Mobile Switching Centers (MSCs). The GAPfiller is a Software Defined Radio and can operate with both open source (e.g., OpenBTS) and proprietary GSM software stacks.
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OpenBTS is a trademark of Kestrel Signal Processing, Inc.