Exemplary methods and systems for providing access to IMS services are disclosed herein. An exemplary method involves a first radio access network (RAN) component: (a) sending a registration message to an IMS network in order to register the first RAN component with the IMS network, wherein the IMS registration message provides an IP address at which to register the first RAN component, (b) receiving a service request from a first access terminal, wherein the first RAN component is a serving RAN component for the first access terminal, and (c) in response to receiving the service request, the first RAN component engaging in an IMS service on behalf of the first access terminal, wherein engaging in the IMS service on behalf of the first access terminal comprises sending the IMS network a first initiation message for a session event, wherein the first initiation message comprises: (i) a field that identifies the first access terminal and (ii) a field that includes an IP address of a second RAN component that serves a target access terminal.