tl;dr - There's a thing called 'codec2' http://www.rowetel.com/blog/?page_id=452 which achieves reasonable digital radio performance at 1200bps (although 2400bps is better)
The thought bubble was: I wonder if/how/could (etc) OTR could be used to provide encrypted open source digital radio. Some background and thoughts: In the Amateur Radio service, cryptography is (99.9%) not allowed. So OTR and ham radio will not go together. In the ham world, there is a protocol called D-STAR, which does digital voice, by using a codec and then putting the bits in frames, perhaps relayed. Many, including me, object to this protocol because it by definition includes a codec which is not openly documented and which cannot be impelmented, it is claimed by the proponents, without infringing patents. Codec2 can be seen in part as a Free software/Free protocol effort to provide one of the more difficult parts of a digital voice system under open terms; David and others working on this are to be commended for what they've accomplished. OTR protects instant messaging, but it would be cool to have something OTR-like to protect digital voice; it seems intuitively obvious to the casual observer that the same properties of PFS and deniability would be equally welcome. The point of a codec, rather than just sending 56kbps, is to be able to use fewer bits to represent voice. This may be less important on the internet than it is on radio, when the channel is limited. One could send codec output over TCP, inside XMPP. One could send the codec output over a UDP stream, associated with XMPP. I would be interested in pointers to audio/video associated acht in jabber. Greg (n1dam)
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