VoIP Cookbook: MOS and R Factor values for G.711, G.723, and G.729
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The effect caused by packet loss occurring in a given network will make the MOS and R Factor value decreasing, as shown on table above. The higher the packet loss, the lower the value of MOS and R Factor.
| Codec | Frame | Packet Loss | MOS | R Factor | Kbps |
|---|---|---|---|---|---|
| G.729 | 20ms | 0% | 4.1 | 83 | 24.8 |
| G.729 | 20ms | 5% | 3.3 | 64 | 24.8 |
| G.729 | 20ms | 10% | 2.7 | 52 | 24.8 |
| G.729 | 20ms | 20% | 1.9 | 37 | 24.8 |
Typically, the frame size used for measurement is 20 ms, with the bandwidth around 25 Kbps. The longer the length of payload or voice frame size, the less bandwidth is needed because the overhead protocol is smaller.
| Codec | Frame | Packet Loss | MOS | R Factor | Kbps |
|---|---|---|---|---|---|
| G.729 | 2.5ms | 0% | 4.1 | 83 | 41.6 |
| G.729 | 5ms | 0% | 4.1 | 83 | 41.6 |
| G.729 | 10ms | 0% | 4.1 | 83 | 41.6 |
| G.729 | 20ms | 0% | 4.1 | 83 | 24.8 |
| G.729 | 30ms | 0% | 4.1 | 83 | 19.2 |