Your memory battery on your telephone system is bad. when power is lost , so is the programming. to fix this , you must go into system programming. From any phone, without picking up the handset. Press #20 Dial 12341, Press #. Press # again and dial 62, Press Line 1 and then press the button of each stn you want to ring ,( The display will show 1 if you press stn 1 and so on.) program each line the same way.
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Press feature key then dial #* password 000000 next, go to sets, hit show, hit next till ringing assingment is display hit show and change from n to y on line ringing assingment. do this for each set and line that need to ring.
To change the ringing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is). with the handset down enter #20 the screen should say MMC DISABLED 1) enter in 1 2 3 4 1 # (that enables programming) 2) enter in #62 the screen should say day ring assn 3) press the line you wish to program 4) press the buttons for the extensions that you wish to ring (the ones in the right next to the handset) 5) press # when finished with the line 6) repeat steps 2 through 5 for the remainder of the lines you wish to change The code for hold recall is #52 enter in your hold recall time in sec. and in a 3 digit format. i.e. 30 seconds = 030 a minute and a half is 090 and so on. press # when finished
it sounds like the memory battery on the main board is no longer working which means that it'll happen again.