Why throughput decrease 20 Mbps with VoLTE?

4G LTE
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Hi all,

Can you suggest me any root causes of this issue.

  • Test throughput before 4G VoLTE, 90 Mbps
  • Test throughput during VoLTE, 70 Mbps

The question is: why the throughput decrease 20 Mbps.

Huawei equipment.

Thanks