To determine how many phone numbers you can reserve, add 10 percent onto the number of licenses that you hold, and then add 10. That is, use N + .10(N) + 10 = R, where N = the number of licenses that you hold, and R = the number of phone numbers that you can reserve.
For example, if you have 100 PSTN Calling licenses, you can reserve 120 phone numbers. This assumes that you have not already acquired some phone numbers for those 100 users.
Article ID: 3148108 - Last Review: 29 Dec 2016 - Revision: 1