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Table 3 Subjective score (MOS-LQS) statistics, separately for the English and French speech files, for the wireless-VoIP, reference, and conventional VoIP degradation conditions.

From: Performance Study of Objective Speech Quality Measurement for Modern Wireless-VoIP Communications

Statistic Wireless-VoIP Reference VoIP
  English French English French English French
Minimum 1.05 1.02 1.30 1.11 2.52 2.09
Maximum 3.80 4.20 4.70 4.67 4.55 4.40
Average 2.43 2.42 3.77 3.63 3.67 3.36
Standard deviation 0.50 0.61 0.89 0.91 0.45 0.53