How To Resolve The Problem "One-Way" Audio Problems - Zycoo CooVox-U20 User Manual

Step2: U50 Configuration
Configure the trunk and dialplan on U50-B, register U50-B IP to U50-A, configuration is same
as above, but you have to replace the public IP with internal IP:192.168.1.21.
Step3: Configure port mapping rule of U50-B on the router
Configure port mapping of U50-B on the router as the same way of step1..
Step4: Connect two sets U50 and make the call
Create extension 601 on U50-A, extension 801 on U50-B, and create the correct outbound
rule.
Notice
Public IP must be provided by network provider. It could be dynamic IP address, and easy to
change; you can resolve this problem by using DDNS.

8.4 How to resolve the problem "one-way" audio problems

If U50 is behind router, to resolve the problem, please set up IP address as below:
Click【Advanced】->【Option】->【Global SIP Settings】:
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