A system and a method for providing a mobile data service to a mobile device over a fixed wireless data network wherein the system comprises an enterprise Mobile Signaling Gateway coupled to a Public Land Mobile Network, an enterprise Mobile Access Controller resident within the fixed wireless data network. The system further comprises an enterprise Mobile User-plane Aggregator coupled to 1) the Public Land Mobile Network, 2) the fixed wireless data network and the enterprise Mobile Signaling Gateway. The enterprise Mobile Signaling Gateway at least establishes an IP tunnel to the enterprise Mobile Access Controller, determines whether a mobile device coupled to the Public Land Mobile Network is registered, directs the establishment of multiple IP tunnels between the mobile device and the network elements of the system, and directs pathways for communicating user-plane and control-plane data between trusted or untrusted transport networks.