[?] Would like to decode and display V22bis data (2400baud)

V22bis (like other low-speed protocols) uses separate frequency ranges for each direction so disentangling the data shouldn't be a problem. In principle, you could feed the signal back into a commercial modem and get it to demodulate it and spill the data to the controlling PC where you could capture it (e.g. with HyperTerminal).

The trick would be to get the modem to think it was connected which might require a lot of trial and error with initialisation settings, etc. It'll be easier if you can establish the connection via a real phone line (e.g. a PBX extension) as the modem may not cooperate if the line voltage and current aren't right. The older (and dumber) the modem, the more likely it is to work.

Are you trying to get yourself or us int jail?? If so, no thank you...

first stop is to get a nice old modem that you can locate the AT command set for.

You can force old modems into believing there is a connect with the correct commands. This will all depend on the modem. This assumes you want the data itself. I fail to believe you're after handshake data, as that's so easy to replicate with two modems.

I'd grab my external MultiTech or Microcom 2400 baud modems for a task like this.

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That is more of a maybe. Though two modems (to two ports) may do it well. V.22bis is QAM not FSK. Higher speeds can get really ugly for using recordings.

I've recently been told about this product which seems to be ideally suited to the job:-

Many thanks to all those in this NG who offered other interesting suggestions.

- Dave