1. A multi-mode user equipment (UE), comprising: one or more hardware processors configured to: cause the UE to transmit a first Access Network Discovery and Selection Function (ANDSF) management object to an ANDSF server maintained within an Evolved Packet Core of a carrier-based access network, the first ANDSF management object including UE profile information, the UE profile information including an operating system identifier (OSId) to uniquely identify a specific version of an operating system of the UE; receive, from the ANDSF server, a second ANDSF management object, wherein the second ANDSF management object includes an inter-system routing policy (ISRP) provided in response to transmission of the OSId in the UE profile information, wherein the ISRP includes an application network routing rule for offloading data of a software application arranged for operation within the operating system of the UE, wherein the application network routing rule of the ISRP is customized to an operating system-specific application identifier (OSAppId) for the software application arranged for operation within the operating system of the UE, wherein the OSAppId is associated with the software application and uniquely identifies a specific version of the software application to execute on the specific version of the operating system of the UE, wherein a value for the OSAppID is defined in a first node of the ISRP, and wherein a value for the OSId is defined in a second node of the ISRP, and wherein the first node and the second node are nested in the ISRP under a third node indicating an application identifier (AppID), wherein the third node indicates use of the application network routing rule for data traffic sent from the software application within the operating system based on the first node and the second node; and perform offloading of data generated from the software application to a secondary access network in accordance with the ISRP.