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VoIP Bandwidth Requirements for Several Common VoIP Compression Algorithms
| Codec |
Codec Bit Rate (Kbps) |
Nominal Ethernet Bandwidth (Kbps) |
| G.711 |
64 |
87.2 |
| G.729 |
8 |
31.2 |
| G.723.1 |
6.4 |
21.9 |
| GSM |
13.2 |
29.2 |
| iLBC |
13.3 |
27.7 |
| G.723.1 |
5.3 |
20.8 |
| G.726 |
32 |
55.2 |
| G.726 |
24 |
47.2 |
| G.728 |
16 |
31.5 |
NOTE: VoIP codecs require the listed amount of bandwidth upstream and downstream
NOTE2: If you have enough bandwidth, but you experience low voice quality make sure:
Your local internet connection is not congested by a
large file download
Your SIP phone is configured to use codec G729 as priority one
more information about codecs
link to a more detailed free bandwidth meter
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