A method and system to help manage resources in a fallback scenario is disclosed. A first network may be configured to serve user equipment devices (UEs) according to a first protocol and a second network may be configured to serve UEs according to a second protocol. The method may involve the first network serving a UE, where serving the UE includes allocating at least one resource to the UE. The method may also involve, after the UE has transitioned from being served by the first network to being served by the second network for a circuit-switched-fallback call, (i) if the UE completes call setup, the first network releasing the resources, but (ii) if the UE does not complete call setup, the first network using the allocated resources to serve the UE after the UE transitions back to being served by the first network.