> Actually, Bell 202 has the option (it has so many options!!) of a
backchannel
> running at 5 bps which is amplitude modulated. Few Bell-202 modems support
it,
> and no-one has asked for it, so we are not working on it.
>
> In addition to Bell-202, we have also developed Bell-103 (300bps FD) and
V.23
> (FD - 1200bps TX, 75bps RX) solutions using the Scenix SX28, and even have
> these designs FCC qualified, and are capable of DTMF decoding and Type I
> Caller ID. A V.22 (DPSK 1200bps FD) design is coming soon...


Is this something you're selling?  I've got some ham radio apps that need
202 modems.