HP 4120 Phone - What is the USB on the side of the phone used for?

HP 4120 Phone - What is the USB on the side of the phone used for? I have searched everywhere for documents on it.

Hi,
If you sign in IP Phone by using a USB cable, you will get simplified sign in and full access to the phone’s Lync Phone Edition features and full functionality. And you can control IP Phone from Lync client.
If you sign in using PIN, then you will get limited access to voice mail, calendar, and call logs, as well as some reduced functionality.
More details:
https://support.office.com/en-nz/article/Sign-in-on-your-IP-desk-phone-50d67e5c-8a51-4f1a-80c4-a78e67be10c9
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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