ITU-T Recommendation G.1070 proposes an algorithm that estimates videophone quality to the QoE/QoS planners. This model can be used by QoE/QoS planners to help ensure that users will be satisfied with end-to-end service quality. Actually they want to avoid under-engineering. The outputs from the model are multimedia quality considering the interactive quality. The application of this Recommendation is limited to QoE/QoS planning. Other applications such as quality benchmarking and monitoring are outside the scope of this Recommendation.