Which core network's bearer model a bearer belongs to. An EPC bearer (an EPS bearer, LTE core) is selected by packet filters; a 5GC bearer is selected by the QFIs mapped onto it (SDAP).

Source code

/// Which core network's bearer model a bearer belongs to. An EPC bearer (an EPS
/// bearer, LTE core) is selected by packet filters; a 5GC bearer is selected by
/// the QFIs mapped onto it (SDAP).
enum CoreNetwork
{
    CN_EPC = 0;
    CN_5GC = 1;
    UNKNOWN_CORE_NETWORK = 2;
}

This documentation is released under the Creative Commons license