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Of all the chapters in this book, this one is probably the one that will mention Asterisk the least! And yet, there is good reason for its inclusion over a number of years of meeting people who create and deploy Asterisk-based solutions, I have found that they do not seem to be aware of the different options for hooking up Asterisk to the wireless world.
Most people have played with one or two of the options, but do not seem to have been exposed to the many ways that exist. Furthermore, the majority of those I meet that have attempted to connect Asterisk with a wireless device (usually a Nokia dual-mode GSM/Wi-Fi SIP phone), have given up after a number of attempts to find the right settings, both on the device and in Asterisk, that achieve a workable hook-up.