This video is reposted from @YeastarVideo's YouTube Channel ([ Ссылка ]).
Generally, there are 4 common causes for the issue:
1. Incorrect SIP NAT settings on the PBX 00:45
2. Incorrect ALG settings on the router 03:37
3. Incorrect Extension NAT settings on the PBX 04:11
4. Incorrect RTP port forwarding settings on the router 04:51
Here are some related online documents you are looking for:
How to Configure PBX NAT Settings: [ Ссылка ]
Understand the PBX NAT Settings: [ Ссылка ]
The Router Settings Relevant with One-Way Audio Issue: [ Ссылка ]
RTP Port Forwarding Reference: [ Ссылка ]
Learn more:
[ Ссылка ]
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