We have a customer that set up paging. Paging has been tested, and working properly. Both analog and digital stations will page out. The problem is the volume will start low and get louder. This problem is intermitten. There are 4 CO trunks in paging group, it happens to multiple trunks and stations. Doesn't matter on distance, cannot seem to analog. I am going to swap CO trunk card. Has anyone had this problem?