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A few of us have bought rebadged versions of these recently and we're looking to create a backend for them that accepts a call (probably via SIP / VoIP) and then demodulates the v.23 and does something useful with it.

Are you aware of anyone thats done this already? We're not desperate to support the encryption initially but I guess it would be nice too.

Thanks

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sorry, no. but there is an emulator[1], so you can test the roms, or you can write your own code and test it without having the hw.

[1] https://github.com/iddq/sim68xx/tree/px1000

Nice, thanks

The SpanDSP library has low-speed FSK modem implementations (including Bell 202 and V.23). I've employed the 202 demodulator to listen in to some radio-based telemetry.

https://github.com/freeswitch/spandsp

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