Rebooting cordless phone bases

There is no specific forum section for the Yealink W52H / W56H phones so I am posting here.

I'm trying to document the way to reboot the various Yealink phones - I don't find any documentation on rebooting this set - there is no X key.

For the more general / complete post please see here:

Originally posted to CP920/CP960...

I would like to capture all the information in one place to assist people supporting a variety of Yealink products as we are.

Thank you.