Apparatus, and an associated method, for a 3G, cellular communication system having an access network and a core network. The access network is operable pursuant to the cdma2000 the operational specification, and the core network is operable pursuant to the 3GPP architecture using GPRS. A wireless gateway that provides an interworking functionality is provided to permit to the access network to utilize GPRS as a transport layer through which to transport packet-formatted data, thereby to effectuate, for example, multimedia applications over IP.