The endpoint sends the register request to FreeSBC however the FreeSBC is not forwarding it to the registrar. Please check the following points to solve this issue;
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Check if SIP domain configured correctly. https://docs.telcobridges.com/tbwiki/Toolpack:Creating_a_SIP_Domain_SBC_A
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Check the SIP domain Status. Be sure domain registrar can be reached by FreeSBC. To check, Go to Status → SIP → SIP Domain → Status → SIP Registration Domains
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Check if SIP client configured correctly to send correct Domain name to FreeSBC. You can capture a SIP trace (see Signaling trace capture tool ) and use wireshark to analyze the trace. Look at the “To:” SIP header: it must match what is in the Sıp Domain configuration of the FreeSBC.
Please check the following wiki for more troubleshooting steps; FreeSBC Troubleshooting Guide