Hi,
we are currently testing the Vovida h323cswg. ATM it doesnt really look good. If we finished testing ill post results here.
h323csgw is a standalone SIP<>H323 Proxy server which was designed to allow H323 clients to register with a SIP Server. This works but we have a hard time getting a SIP-Server <> H323 Gatekeeper connection working. Maybe you want to try this too.
Asteriks is rumored to be able to proxy SIP<>H323 but i didnt had the time yet to test it.
regards,
Arnd