1. Run Call Viewer under tools depot to verify call from ipcc does go to cm which then does hit Unity
2. If #1 is cool, find out which number is coming in. Not sure how your doing your CM call routing but I would use a cti rp for forwarding calls or TP for direct calls. Anyways, base on the method you use, you will see a consistent ani or forwarding number on the viewer
3. On call routing rules, add a rule to match the method your using, and send it to Unity's "Sign In"