If you have a total of 51 Phone System and Audio Conferencing licenses, you can get 20 toll service numbers. For Audio Conferencing with dial-out to USA/CAN subscription licenses (free in select geographies), 1 toll service number is given in addition to the numbers that are automatically granted when onboarding to the service, regardless of the number of licenses acquired. If there are 50,000+ licenses then 1500 telephone numbers are given. If there are 20,000-49,999 licenses then 1000 telephone numbers are given. If there are 15,000-19,999 licenses then 700 telephone numbers are given. If there are 10,000-14,999 licenses then 600 telephone numbers are given. If there are 7,000-9,999 licenses then 500 telephone numbers are given. If there are 3,000-6,999 licenses then 420 telephone numbers are given. If there are 2,000-2,999 licenses then 210 telephone numbers are given. If there are 1,500-1,999 licenses then 160 telephone numbers are given. If there are 1,250-1,499 licenses then 135 telephone numbers are given. If there are 1,000-1,249 licenses then 125 telephone numbers are given. If there are 750-999 licenses then 110 telephone numbers are given. If there are 500-749 licenses then 90 telephone numbers are given. If there are 200-499 licenses then 65 telephone numbers are given. If there are 150-199 licenses then 40 telephone numbers are given. If there are 100-149 licenses then 30 telephone numbers are given. If there are 50-99 licenses then 20 telephone numbers are given. If there are 26-49 licenses then 10 telephone numbers are given. The number of phone numbers is equal to the total number of Phone System and Audio Conferencing licenses and uses the following: If there are 1-25 licenses then 5 telephone numbers are given.

If I have 50 users in total with 30 of them on a Domestic Calling Plan or International Calling Plan, and 20 of them on a Pay-As-You-Go Calling Plan, you can acquire 63 phone numbers (30 x 1.1 + 10) + 20. If you have Pay-As-You-Go licenses, you can only acquire 1 phone number per license. The number of phone numbers is equal to the total number of Domestic Calling Plan and/or International Calling Plan licenses multiplied by 1.1 + 10 extra phone numbers. The limits below don't include telephone numbers you have ported to Microsoft.

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