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Estimate VoIP Network Bandwidth Requirements

If you plan to use VoIP for your Virtual Contact Center voice channels, you must determine whether your network has sufficient capacity to carry the VoIP traffic.

VoIP equipment used in conjunction with Virtual Contact Center must comply with either of the G.729 or G.711a law or G.711μ law CODEC standards.

The following table is a summary of the voice quality and bandwidth usage for the two supported CODECs by Virtual Contact Center.

CODEC Voice Quality and Bandwidth Usage
  • Transmits compressed voice (2nd choice recommendation for temporary use until Internet capacity can be increased to support G.711a/μ uncompressed voice encoding)
  • Good voice quality
  • Requires approximately 30 Kbps per VoIP call
  • Transmits uncompressed voice (1st choice recommendation; provision Internet capacity accordingly)
  • High voice quality
  • Requires approximately 90-Kbps per VoIP call center

    Note: When setting up devices to use an uncompressed voice CODEC, enable both G.711a law and G.711μ law capabilities available on the device. This prevents call quality loss by eliminating transcoding of international VoIP calls. This has no impact on bandwidth requirements, as either choice uses 80 Kbps per call.

You can estimate the amount of network bandwidth required to support your agents' VoIP telephones.

To estimate the network bandwidth required to support a VoIP station:

  1. Choose the CODECs you plan to deploy in your network.
  2. Multiply each CODEC's bandwidth requirements by the number of simultaneous calls the network must support.
    For example, if you are using a G.711a/μ CODEC, and you need to support 100 simultaneous calls, then multiply 90 Kbits per second by 100 calls to calculate that you need 8.79 Mbps of symmetrical transmit-and-receive bandwidth to support the estimated call volume.
  3. Add the bandwidth required to support VoIP traffic to the bandwidth required to support your existing network traffic.
    When calculating total network load, be sure to include all applications that use the network, especially applications with high bandwidth requirements (such as video conferencing).


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