My parents are on Vodafone VDSL, and Vodafone has recently moved them to "calling over broadband". Since they previously had a couple of wired phones plugged into different jackpoints, Vodafone sent them a dual cordless phone - a Panasonic KX-TG2722. They're experiencing a problem where every time they receive a voicemail, the time and date on the phone base station are reset (I think to Jan 1).

From a quick google, it sounds as if Vodafone is sending the wrong time information with CallerID, and the Panasonic phone is set to update its time based on that. Unfortunately, there doesn't appear to be a menu option on this model of Panasonic phone to change the Time Adjust setting from Auto to Manual. My parents haven't had any luck with Vodafone support, and they do seem to need to know the date and time their messages have arrived.

Has anyone else encountered this problem, and if so, have you found a solution?