Kevin,
We are also implementing attachments in our CRM Service Request Management application. I am following this thread hoping some experts can answer your question (i.e.,point you to a good documentation). I couldn't find it myself.
We use ArchiveLink in CRM just like we have in ECC. Our content server is IBM ECM P8 / FileNet. We configured ArchiveLink the same way as in ECC (e.g., OAC0, OAC2, OAC3).
Regards
-Nur Djuned