All info regarding the GXP2200 voip phone:
http://www.grandstream.com/support/resources/?title=GXP2200
User manual:
http://www.grandstream.com/sites/default/files/Resources/gxp2200_usermanual_english.pdf
The default login name for the administrator is "admin". The default administrator password is set to "admin". The default login name for end-users is "user" while the default user password is set to "123".