Can you see "Mailhandler nodes" in Feeds importer view? Mailhandler node has been set to use Fax processor. If you are not seeing Mailhandler node then probably you are missing some of the dependencies.
Also make sure you do not update Feeds importer and Mailhandler modules. Use the one provided in ictfax install package.
Great work ! After this step, I can't find the Fax processor, only Node, User & Taxonomy. Where do I find or create this ?