We've had this issue for some time and still not sure of the cause. We're on MiVB 8.0. The issue is related to Dynamic Extension, whereas when an internal call is made to the DE extension in question via its extension #, the cell phone gets "Restricted" as the Caller-ID even though the COS has been flagged as a pass-through (Hot Desk External User - Display Internal Calling ID set to YES). Our trunking service is SIP however we had this same issue with a pure PRI. Any ideas as to why the Caller-ID info isn't going through?