GW0227 and GW0321 series, known BUG's
1) 	generally use save, then reboot after each change, applies to any page.
2a)	Dial plan, SIP port etc. should be set before adding serviceprovider (see 2b)
2b)	add/modify BUG, when adding serviceprovider this must be done right. 
	Modify is not working correctly. So you must delete a serviceporvider in order to add a "new" correct set service provider. 
3)	remember to set the reset-button off, to avoid accidental resetting of device.