Listening Quality
 
 
Conversational Quality
 
   
Mouth-to-Ear Delay : 300-400 ms
 
 
Transmission Quality
 

MOS (Mean Opinion Score)

MOS指標 使用者滿意度
5 很好 (Excellent)
4 好 (Good)
3 普通 (Fair)
2 差 (Poor)
1 極差 (Bad)
 

E-Model
 

Mean Opinion Score (MOS)

MOS Index User Satisfaction
5 Excellent
4 Good
3 Fair
2 Poor
1 Bad
 

Typical Representation of Call Quality Level

User Opinion MOS (ITU Scaled)
Very satisfied 4.3-5.0
Satisfied 4.0-4.3
Some User Satisfied 3.6-4.0
Many User Dissatisfied 3.1-3.6
Nearly All User Dissatisfied 2.6-3.1
Not Recommended 1.0-2.6
Web Page Copyright: 亞洲大學資訊電機學院 連耀南 yaonanlien@asia.edu.tw  mos.htm,  Tue Jun 13 18:53:38 CST 2023