a device for performing an imsho using a router in a cdma communication system is disclosed . the device comprises a router module allocated to each mobile switching center in the cdma system , the router module for interfacing with a global communication interconnection network ; a base station subsystem provided in each mobile switching center connected to the router module includes the gcin ; a base station modulator connected to the gcin in the bss for providing a link configuration information of the router module ; and , a trunk for connecting the router modules of different mobile switching centers to enable the communication between the base station subsystems belonging to different mobile switching centers .