How successful is E-Model, a tool for measuring QoS for VoIP? Though European countries accept E-Model, there has been a considerable rejection from North America. How important do you think E-Model is?
The ITU-T Study Group 12 is still working on a lot of unanswered questions with regard to applying the E-model to VoIP networks. See this
For now, the best algorithm in use for measuring voice quality over an IP network is the PESQ algorithm defined...
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by ITU-T P.862. There are a lot of test equipment vendors that support this algorithm.