E-government plays an important role in providing better public services to people. Nowadays, there is an emerging trend in the e-government domain called 'whole-of-government approach' that advocates for collaborative and integrated e-government to deliver more effective and efficient services. In the Philippines, most of government e-services remain in isolated silos and agency-specific applications. Therefore, the purpose of this study is to examine how can government e-services in the Philippines be integrated using the whole-of-government approach. Drawing upon the literature, we propose an interoperability framework base on service-oriented architecture (SOA) which is going to be validated using qualitative research methods. This study contributes to the e-government interoperability literature by exploring how e-government be integrated in the context of the Philippines.