Asterisk for Voicemail ONLY

I have an existing PBX, Toshiba Strata DK16e. Is it possible to just use the Asterisk box as a voicemail system only? Also, what type of card would I need to interface with the PBX?

Thanks.

You sure can. It depends on the system If it is SIP enabled I would do it that way. Other wise you may want an E1/T1 card (provided that your system has that option). I am not sure on how you would set up MWI.