Cisco 7821 Registration Problems

Hello, I currently have a Cisco CP-7821-3PCC registered with 3CX on line one, and would like to register line two with FreePBX. For the proxy and outbound proxy, I set it as my FreePBX server’s IP address, and for the User ID, and Auth ID, I set it as 301 (my extension). For the password, I set it as the FreePBX extension secret. When I submitted these changes and rebooted the phone, it ran into registration problems. I checked the firewall and everything looks good, can somebody help me here? Thanks.

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