We are working with a third party FAX solution that will route incoming faxes into specified inbound directories, based on phone number. I am using SI to control the flow of these files, but the 3rd party solutuion has introduced a small gotcha. Unfortunately, rather than submitting a single "tar" or "zip", each fax transmission is comprised of 2 files (image and meta-data). I created a custom filter to relate the files together, but I am forced to manually manage the secondary file outside of the SI adapters, which I do not like.

I know there is a better way to do this. Does anyone have a good idea on how to implement a better solution for this?