LIONS’ NSA BBU cooperates with 4G LTE EPC core network. The first implement follows O-RAN standards and O-CU and O-DU definition. The package is running on COTS (Commercial off-the-shelf) server. LIONS O-CU and O-RU finishes Interoperability test with CISCO 4G EPC in a short time. Minor problems are solved with minimum modification to BBU.