So I (Hadley) went to setup a Yealink T22P the other day and couldn't access the administration web page or the settings menu on the phone itself. This was puzzling. I looked up the default username and password in the user manual just to make sure I wasn't going mad. The manual says admin/admin which is what I was trying to use.

After talking with our support guys it seems that a few of the Yealink T22P units slipped out of the factory without the password being set so if you come across this user "admin" as the username and a blank password.

I know at least one customer was caught out by this too. My apologies for that and hopefully others find this post before going to too much trouble.