asterisk users - Jun 2005 - Getting a Quintum AS200 to connect with Asterisk using SIP?

Does anyone have any instructions on how to connect a Quintum AS200 to
Asterisk as a SIP phone?

I currently have the AS200 sitting in a remote office and would like
to use it as a SIP phone.  It would register with Asterisk.

Overall, I've had problems getting this work but I'm hoping that
someone on this list might have some experience with this!