Thinkster
Any voicemail would work that uses analog port.(slt).
You would need a MSLC 2 card, for your slt access or a SLC card.
Remember, Samsung no longer supports this product, and it could be a little tricky.
Power supply is rather soft, and they do blow rather easy.
Myself, i would not take on the project, as there
are a lot of variables involved.
Good luck to you sir.
Remeber the battery on the cpu might go south on power down of unit ( old )