An H. 323 phone registers to a gatekeeper across a VPN. This phone has worked in the past but now fails to register with the gatekeeper. All other H. 323 phones in remote locations work fine. What would be the BEST troubleshooting action to take next?

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An H. 323 phone registers to a gatekeeper across a VPN. This phone has worked in the past but now fails to register with the gatekeeper. All other H. 323 phones in remote locations work fine. What would be the BEST troubleshooting action to take next?