Hi @dianne30_75
You have to review each number in the CID list for this list counter to go back to 0 (zero).
Every time a new call comes in, the CID (caller ID) number is entered into a list.
With most phone systems, the number is only displayed for a short while before the display changes to let you know how many calls are in the list that you haven't checked, if you didn't notice the number when the phone first rang.
What is the make and model number of your phone? Look in the user manual to find out how to review the numbers.
The numbers in the list are still there after you have reviewed them unless you delete them from the list or the list overflows (so systems only store 50 numbers) BUT the "new" call counter information will be either 0 or whatever the number of calls that are left that you haven't yet reviewed i.e. if you only review 2 calls then it will show 28 etc.