One annoying thing with configuring Linksys or Cisco SPA VOIP phones remotely is that web administration interface doesn’t have option to reboot the phone. There is a little trick which allows to do exactly this though. Simply add /admin/reboot to the phone’s IP in web URL (e.g. http://192.168.0.51/admin/reboot) and providing there are no active calls, phone will reboot.

Tested on:
Linksys SPA942
Linksys SPA962
Cisco SPA504G