A first mobility management entity associated with a packet-switched wireless access network receives information associated with a mobile station being served by the first mobility management entity, where the information identifies a serving generic access network controller for the mobile station. The serving generic access network controller is used to provide a circuit-switched service to the mobile station while the mobile station is attached to the packet-switched wireless access network. The first mobility management entity initiates a handoff of the mobile station from the packet-switched wireless access network to a circuit-switched wireless access network, where the circuit-switched wireless access network is in a region served by a second generic access network controller different from the serving generic access network controller. In performing the handoff, the first mobility management entity uses the information to identify the serving generic access network controller to communicate handoff-related messaging to the serving generic access network controller to cause provision of the circuit-switched service to be handed off from the serving generic access network controller to the second generic access network controller.