Trixbox as H323 extension on Cisco Call Manager

Hi guys,

I've trawled this forum but been unable to find any relevant info so appologies if this has been asked and i've missed it.

Basically our situation is that we have a trixbox server setup running an IVR with options to various voicemail boxes (no phones involved, essentially a glorified answering machine).

Our current setup links this server to a standard phone line via an interface card.

This server needs to move sites and rather than purchasing an extra line I thought it would be a good idea to link it into our Cisco call manager.

Now I know with the latest version of call manager there would be no problem but we are running 3.3 and its not an option to upgrade at this point.

What i need to be able to do is essentially add the trixbox server as an extension on our call manager. Anyone know how i would go about this? I know i will have to use H.323.

Thanks

John