Patent ID: 8693467

Claim:
An apparatus for providing notifications of a circuit switched event over a packetized data network, the apparatus comprising: a dual mode mobile station, operatively coupled to a packetized data network, configured to transmit and receive circuit switched fallback notifications to an interworking interface via a tunnel over said packetized data network, said mobile station comprising: a tunneling link access control processor, configured to transmit a circuit service message to said interworking interface, and configured to monitor said packetized data network for reception of an acknowledgement message from said interworking interface, and configured to retransmit said circuit service message after expiration of an acknowledgement timer, wherein retransmission of said circuit service message is precluded by said tunneling link access control processor when a message sequence context timer expires wherein retransmission is precluded by setting an allowable number of retransmissions to be less than a number that would exceed said message sequence context timer when employing said acknowledgement timer.