How much bandwidth will I need?

Modified on Wed, 09 Aug 2017 at 05:18 PM

Use the example below to calculate you voice/phone bandwidth requirements. If you plan to deploy your phones using a shared internet connection; for both voice and data that is, you will need to factor in the bandwidth your data network and computers will normally require as well.  As a rule of thumb, it's always better to over estimate than under estimate.  

1 active call = approximately 100 Kbps (upload and download)

10 active calls = approximately 1.0 Mbps (upload and download)

Additional information for geeks like us:

Actual bandwidth consumption depends on the codec being used. When calculating bandwidth we can't assume every channel is used at all times during a call. Normal phone conversations include a lot of silence, which often means little or no packets are sent. So even though a single voice call may initially set up two 64 Kbit RTP streams over UDP, over IP, over Ethernet (which adds overhead), the full bandwidth is not used at all times.

The following table shows how the codec's theoretical bandwidth usage expands with UDP/IP headers

Codec Bit Rate Nominal Ethernet Bandwidth (one direction)
G.711 64 Kbps 87.2 Kbps
8 Kbps 31.2 Kbps
6.3 Kbps 21.9 Kbps
G.723.1 5.3 Kbps 20.8 Kbps
32 Kbps 55.2 Kbps
24 Kbps 47.2 Kbps
16 Kbps 31.5 Kbps
G.722 64 Kbps 87.2 Kbps

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