< mgcp default-package hs-package < no mgcp fax t38 ecm < mgcp fax t38 inhibit < no mgcp fax-relay sg3-to-g3 < no mgcp explicit hookstate

There’s something important in there. Without those lines, a Cisco 3845 Voice Gateway controlled by Cisco Unified Communications Manager won’t answer inbound calls. With those lines, suddenly inbound dialing works. Amazing.