ETSI and HEAD acoustics pursued their success with the 5th ETSI Speech Quality Test Events (SQTE) where speech quality tests on VoIP implementations, IP gateways and IP terminals have been carried out. These tests are single vendor tests and not interoperability tests between different manufacturers.
The speech quality tests cover all conversational aspects like one-way transmission scenarios (listening speech quality), echo and double talk performance tests as well as quality test in the presence of background noise. "Real life" scenarios, e.g. background noise and conversational situations including double talk play an important role for network echo cancellers in IP gateways and acoustics echo canceller in IP phones.
The 5th SQTE "state of the art" anonymous report provides a summary and a comprehensive overview of the performed speech quality test results.