A fixed wireless terminal (29) comprises interfaces (32, 34) and a controller (40), e.g., a Generic Access Network Controller (GANC). The controller (40) is configured to interwork Generic Access Network (GAN) signaling employed between the mobile wireless terminal (29) and the fixed wireless terminal (30) with circuit switched signaling employed between the fixed wireless terminal and the radio access network (22). The interworking enables the controller (40) to provide a circuit switched mobile telephony core network service to the mobile wireless terminal (30).