Port forward the below ports according to your usage scenario：
8111（TCP/UDP, for linkus app login），
5060 UDP (For sip register)，
5061 TCP（For TLS protocol），
10000-12000 UDP (For voice, forward to the external ports must to be the same as internal ports. Means external port must to be 10000-12000 )，
8088 TCP（For web access）
As shown below.
Also, it is recommended to disable the NAT on the IPv4 Policy if you are facing no audio or one way audio issue.
As shown below.
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