T46G

[Travis_Yealink]

Hi Nanna,

According to your description, it's Yealink RPS feature that cause this issue.

The phones were already done the RPS development, and once the phones reboot, the phones will send request to the server that preset, and then download the configuration file and firmware, then do re-provision on the phones.
This is why when the phones connect to a LAN with Internet will cause this issue, but connect to a LAN without Internet access won't.

Normally, we suggest customer contact the service provider/distributor for help, and ask them to re-upload the .cfg file to the RPS for you.
however, you told me that you brought these phones from Ebay, which makes me confused about who added these mac address on our RPS server. Is there any information you can provide to me? and then I will help you check.