I used to use an iDEN phone, data cable and a clunky Motorola made software program. It wasn't like Trunker, et al but was more event reporting. Seems liked it didn't report everything either. It did show a lot though.
Most people think an iDEN control channel is just CC data but the protocol allows the CC to be used for voice and data traffic via TDMA. It would seem to be a difficult protocol to engineer a decoder app for if doing it in your spare time.
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