In case anyone's interested, I've documented how we interfaced FS with
Lumenvox via MRCP using FS' event socket and unicast interfaces and a
bit of Perl here:
http://www.softivr.com/wiki/index.php/FreeSWITCH_MRCP_in_Perl
Three surprises: that it worked at all, that it works quite well and
that it was really quite easy to do.