This Recommendation describes the procedure, requirements, physical configuration and standard document sets for service testing framework for VoIP at UNI of NGN. Other service tests are for further study. The purpose of this Recomendation is to describe the service testing framework for VoIP at UNI for NGN in order to confirm the conformity to the relevant ITU-T Recommendation and assure the interoperability of the NGN products at the specific interface.