scope:

The present document addresses a new approach to assess or anticipate the conversational quality of end-to-end transmissions. It is based on the adaptation of the ETSI QoS Model (hereafter referred to as E-Model) in order to better consider results from field testing.

The present document defines the principles of this new approach, the test conditions including test equipment test setup, the conversational subjective test plan and the results of the tests conducted for this new approach.

The model takes into account the variable parameters such as end-to-end delay, talker echo, degree of interactivity between the subjects (expressed as Talker Alternation Rate) and listening quality.

Comparisons between the new model and other approaches such as E-Model are also made available.