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Frequently Asked Question - Why do I have one-way voice on remote extensions or remote IP PBX?

Why do I have one-way voice on remote extensions or remote IP PBX?

Usually the one-way voice problem on remote extensions or remote IP PBX is caused by NAT, you need to check NAT Support Settings on page Advanced-->Global SIP Settings. External Host and External IP need to be configured with your public IP address or DDNS domain, and make sure the Local Network is correctly pointed to your subnet.