Hello, friend!
The number of concurrent voice calls is determined by the voice daughter board on the control board. The number of concurrent voice calls varies according to the voice daughter board model. You are advised to use the Feature Spec Finder to query the number of online users of the voice service.
For carrier: https://support.huawei.com/onlinetoolsweb/spec_en/index.jsp
For enterprise: https://support.huawei.com/onlinetoolsweb/spec_en_E/index.jsp
Note: Number of concurrent voice users or a maximum number of online users ≠ Number of voice ports or number of voice users. The number of concurrent voice users depends on the capability of the daughterboard and the usage of DSP resources. The number of voice ports or the number of voice users can be obtained from the hardware configuration of the device.
Thanks!