Pjsip send notify command works remotely but not on site

FreePBX Asterisk 13.32.0

In the past I have rebooted phones on our network via the FreePBX GUI Asterisk CLI with pjsip send notify restart-yealink endpoint 207 (to reboot ext 207 only)
Now, when I run that command within the local network, I receive this response: Sending NOTIFY of type ‘restart-yealink’ to ‘207’
But nothing happens at ext 207.
However, if I send the command from a remote computer via VPN, I get the same response, and the phone reboots.
Can anyone explain why that might happen and how to fix?

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