I am using a program to calculate the number of voice circuits needed to carry a specified number of minutes per month. I ran across some work that divided the minutes per month by a constant of 19,187 to get the number of DS-O circuits. The two methods do not equal one another. Has anyone heard of the second method? If so, is the 19,187 correct? For the telecom tools, I am using 30 days in a month, 24 hours in a day, 7% busy hour traffic, and 1% blockage.