This read-write enumerated value restricts what type of physical trunk the PXM routing controller may use for this connection - forcing it away from satellite trunks, away from terrestrial trunks, or leaving it unrestricted to use either. Admins use this for connections sensitive to the propagation delay characteristics of satellite links (like real-time voice), steering them exclusively onto terrestrial paths. For example, an admin provisioning a delay-sensitive voice connection would set ausmRestrictTrunkType to terrestrialTrunk to prevent PXM from ever routing it over a high-latency satellite trunk.