There's also mod_h323 you can try which is based on another library. I've found both to have stability problems, which seems to be an issue of the libraries themselves and the very tight requirements between which version of opal/openh323 and pwlib/ptlib you're running.
I've successfully used Yate as a H323-SIP proxy. It also had periodic crashes within the H323 library, but since it's contained to the H323 calls avoids knocking out any other calls (eg SIP).
SIP is far far more stable, and used by more people. If you have the ability to use it, do so.
But do please file a Jira on the H323 crash - any segfault is always a bug.
-Steve