Bandwidth consumption depends on which codec is used for conversation. Normal conversation includes a lot of silence which means that full bandwidth is not used all the time. Also, each codec stream can result in a larger bandwidth due to IP and UDP headers and overheads. The following data displays the bandwidth usage with and without the UDP/IP headers:
| Codec | Bit rate | Total Used Bandwidth |
|---|---|---|
| G.711 | 64 Kbps | 87.2 Kbps |
| G.729 | 8 Kbps | 31.2 Kbps |
| G.723.1 | 6.4 Kbps | 21.9 Kbps |
| G.723.1 | 5.3 Kbps | 20.8 Kbps |
| G.726 | 32 Kbps | 55.2 Kbps |
| G.726 | 24 Kbps | 47.2 Kbps |
| G.728 | 16 Kbps | 31.5 Kbps |
| iLBC | 15 Kbps | 27.7 Kbps |
| GSM | 14.7 Kbps | 20.7 Kbps |