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  1. 8

    Panasonic ns 500 phone registration

    Checking the registrar's logs for more detailed error messages - Using a network protocol analyzer (e.g., Wireshark) to capture and analyze the SIP registration traffic - Temporarily disabling any firewalls or NAT devices to see if they're causing the issue
  2. 8

    Panasonic ns 500 phone registration

    The error 403 typically indicates a forbidden or unauthorized access. Since the registration works with the 192.168.0.x IP range but not with the 172.200.7.x range, here are a few potential causes:

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