A communication method, comprising: receiving, by a femto cellular interconnection device, Hub Femto, a first call request of a first fixed line telephone terminal sent by a private branch exchange, the first call request carrying an identifier of a first mobile terminal; determining, by the Hub Femto, that the first fixed line telephone terminal and the first mobile terminal are located within coverage of the same local area network; performing, by the Hub Femto, signaling conversion between fixed line telephone network signaling and mobile network signaling for the first call request within the local area network; and sending, by the Hub Femto, the first call request after the signaling conversion to an access point, AP, in a mobile network to which the first mobile terminal belongs, so that the AP initiates a call request to the first mobile terminal according to the identifier of the first mobile terminal; characterized in that a terminal information list is stored in the Hub Femto, or a terminal information list is stored in a home nodeB management system, HMS, and the Hub Femto obtains information of the terminal information list from the HMS; wherein the terminal information list includes short numbers of mobile terminals, long numbers of mobile terminals, and correspondences between short numbers of mobile terminals and long numbers of mobile terminals, the short numbers of mobile terminals are the identifiers of the mobile terminals used in the local area network, and the long numbers of mobile terminals are the identifiers of the mobile terminals used in a macro network; the identifier of the first mobile terminal is the short number of the first mobile terminal; and that if the first mobile terminal cannot be connected, the Hub Femto converts the identifier of the first mobile terminal into the long number of the first mobile terminal according to the correspondences between short numbers of the mobile terminals and long numbers of the mobile terminals in the terminal information list, and uses the long number of the first mobile terminal to initiate a call request to a mobile core network device of a macro network to which the Hub Femto belongs, or uses the long number of the first mobile terminal to initiate a call request to the private branch exchange, so that the private branch exchange initiates a call for the first mobile terminal to a fixed line telephone core network device to which the private branch exchange belongs. receiving, by a femto cellular interconnection device, Hub Femto, a first call request of a first fixed line telephone terminal sent by a private branch exchange, the first call request carrying an identifier of a first mobile terminal; determining, by the Hub Femto, that the first fixed line telephone terminal and the first mobile terminal are located within coverage of the same local area network; performing, by the Hub Femto, signaling conversion between fixed line telephone network signaling and mobile network signaling for the first call request within the local area network; and sending, by the Hub Femto, the first call request after the signaling conversion to an access point, AP, in a mobile network to which the first mobile terminal belongs, so that the AP initiates a call request to the first mobile terminal according to the identifier of the first mobile terminal;