It is presented a method for a femtocell base station, for facilitating communication between a communication terminal and a core network. The method comprises the steps, performed in the femtocell base station, of: sending a first femtocell base station message to the communication terminal; receiving a first terminal message from the communication terminal, the first terminal message comprising a first sequence number; and repeatedly sending further femtocell base station messages to the communication terminal and receiving corresponding terminal messages, comprising incremented sequence numbers, from the communication terminal, such that an expected next terminal message from the communication terminal comprises a sequence number being equal to the first sequence number. A corresponding femtocell base station, computer program and computer program product are also presented.