A filter circuit comprises a balanced port, an unbalanced port and a substrate. The compensation apparatus includes a quadrature demodulation compensation section that compensates for the quadrature-demodulated signal including an I signal and a Q signal. In another embodiment, the type of service requested, for example whether the request is for an IMS service or non-IMS service, may be used to evaluate whether the a request for access to the network should be permitted.