Different kinds of phone numbers used in Skype for Business Online

Skype for Business Online uses different telephone number types depending on the purpose for which you want to use the telephone number. Skype for Business Online uses subscriber numbers which can be assigned to users in your organization and service numbers which are assigned to services such as Audio Conferencing in Office 365, auto attendants or call queues. Service phone numbers have a higher concurrent call capacity than subscriber (or user) numbers. Service phone numbers are available but will vary by country/region and the type of number (whether it's a toll or toll-free number). If you need additional or other number types other than those numbers seen in the Skype for Business administration center, you may submit a phone number request to the Microsoft telephone number service desk.

  • Subscriber Numbers

    Subscriber numbers are assigned to users and there are two kinds:

    • Geographic numbers Geographic numbers have a relationship to a geographic area and are the most common. For example, geographic telephone numbers in most cases can only be used within a certain address, city, state or region of the country.

    • Non-Geographic numbers Non-geographic numbers are national numbers which don't have a relationship to a geographic area within a country/region. For example, non-geographic numbers often have the same cost when calling the number from anywhere within the country/region. Also, some countries like Denmark that only have non-geographic numbers available.

  • Service Numbers Service numbers are available in several different number types and availability does vary by country/region.

    • Toll Service Numbers

      Toll service numbers may incur a toll cost to the caller and there are two kinds:

      • Geographic numbers Geographic numbers have a relationship to a geographic area. For example, geographic telephone numbers in most cases can only be used within a certain address, city, state or region of the country.

      • Non-Geographic numbers Non-geographic numbers are national numbers which don't have a relationship to a geographic area within a country/region. For example, non-geographic numbers often have the same cost when calling the number from anywhere within the country/region. 

    • Toll-Free Service Numbers These service numbers don't typically incur a toll cost to the caller. Skype for Business Online provides national toll-free numbers in over 60 countries/regions.

      Caution: Some countries/regions and originating number types, such as calls originating from mobile phones, may in some cases, incur a toll cost to the caller.

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