A call forwarding method in a PUSH service is performed in a PUSH service providing system which includes a PUSH server, a MT (multi-tunnel) server, and a FMC (fixed mobile convergence) terminal on which an MT client is mounted. The MT server and the MT client may be connected through a first communication path and/or a second communication path. The MT client is allocated an MTC Internet address (multi-tunnel client IP address) from the MT server. The MTC Internet address may be uniquely defined by the MT server. The FMC terminal registers the allocated MTC Internet address with the PUSH server. When a PUSH message including the MTC Internet address is transmitted from the PUSH server, the MT server determines a corresponding MT client on the basis of the MTC Internet address, and selects the first or second communication path to transmit the PUSH message to the corresponding MT client. According to one embodiment, the MT client may request the MT server to transfer the MTC Internet address, and the MT server may select one MTC Internet address of a corresponding MT client from an MTC Internet address pool and transmit the selected MTC Internet address to the MT client.