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Mccauley mccauley at gmx.netHope some members of this list will find interesting this paper & source code. Recent research paper that analyzed the security features of the APCO Project 25 (P25) digital two-way radio system. P25 radios are widely deployed in the United States by state, local and federal agencies, first responders, and other public safety organizations. http://www.usenix.org/events/sec11/tech/full_papers/Clark.pdf Digital Speech decoder an open source software package that decodes several digital speech formats: P25, ProVoice, NEXEDGE/IDAS and MOTOTRBO (Based on ETSI DMR Standard of especial interested for those of us in Europe given is strongly promoted as a cheap alternative to TETRA). Also worth to mention that supporting mbelib implement IMBE/AMBE Codec. http://wiki.radioreference.com/index.php/Digital_Speech_Decoder_(software_package)