To decide your future network capacity needs, divide the number of voice equivalent you calculated, as per step above, by an SIP concentration factor of 6 (this can be a factor between 5 to 20, we typically use 6 in our cases), it give the minim numbers of concurrent SIP trunks needed to support your current network into your future network architecture.
To determine your future network capacity needs, divide the number of voice TDM-Trunks equivalent you calculated, as per step above, by an SIP concentration factor of 6 (this can be a factor between 5 to 20, we typically use 6 in our cases). This calculation will give you the minim number of concurrent SIP trunks needed to support your current network traffic into your future network architecture.