A CDMA mobile data communication system and method of wireless data communication is provided for mobile-to-mobile data communication. The system may include a plurality of mobile stations, a plurality of base stations and base station controllers, a plurality of switching centers and data network interworking units. A first traffic channel may be established after a first call from a calling party mobile station to the data network interworking unit. A second traffic channel may be established after a second call from the called party mobile station to the data network interworking unit is established when a data response is transmitted from the called party mobile station and the mobile data path connection module informs the public network data path connection control module of the normal state of the first data path. A call may be established through the second data path between the mobile switching center and the data network interworking unit. The first and second traffic channels may be connected through at least one modem.