asterisk users - Jan 2005 - CallManager 3.1 (2c) and Asterisk Integration

Hello
I want to provide a CCM (versiomn 3.1, no SIP) with VoiceMail 
capabilities using asterisk as a voicemail server. Have anyone tried to 
do this. How do I connect this? As an H323 trunk?

Thanks in advance
Andr?s