What is Phone System in Office 365

  • 4/29/2020
  • Applies to: Skype for Business, Microsoft Teams

A Private Branch Exchange (PBX) is a phone system within a business. Phone System in Office 365 gives you PBX capabilities, but without the complicated and expensive equipment.

Phone System allows you to replace your existing on-premises PBX system with a set of features delivered from Office 365 that is tightly integrated into your cloud experience. For more information about the features, see Here’s what you get with Phone System in Office 365.

Phone System technology

Phone System enables call control and PBX capabilities in the Office 365 cloud with Microsoft Teams and Skype for Business Online.

With Phone System, users can use Teams or Skype for Business Online to place and receive calls, transfer calls, and mute or unmute calls. Phone System users can click a name in their address book, and place Teams or Skype for Business Online calls to that person. To place and receive calls, Phone System users can use their mobile devices, a headset with a laptop or PC, or one of many IP phones that work with Teams and Skype for Business Online. Phone System administrators can manage calling options and settings from the same console used for messaging, collaboration, and so on.

Calls between users in your organization are handled internally within Phone System, and never go to the Public Switched Telephone Network (PSTN). This applies to calls between users in your organization located in different geographical areas, removing long-distance costs on these internal calls.

For calls outside your organization, Microsoft provides multiple options for connecting Phone System to the Public Switched Telephone Network (PSTN).

Connect to the Public Switched Telephone Network (PSTN)

Phone System can be connected to the PSTN in one of two ways:

  • Purchase a Microsoft Calling Plan (domestic or domestic and international) for Office 365. Microsoft Calling Plan is an all-in-the-cloud solution with Microsoft as your PSTN carrier. For more information, see Phone System and Calling Plans.

  • Use your existing telephony infrastructure for on-premises PSTN connectivity.

    For your Teams users, you can connect your on-premises telephony infrastructure to Phone System by using Direct Routing. For more information, see Phone System Direct Routing.

    For more information about all Microsoft telephony solutions, see Microsoft telephony solutions.

Phone System with services

Phone System can be used for services and voicemail, such as:

  • Auto attendants – Auto attendants can be used to create a menu system for your organization that lets external and internal callers move through the system to locate and place or transfer calls to company users or departments in your organization. See What are Cloud auto attendants?.

  • Call queues – Call queue greetings can be used when someone calls in to a phone number for your organization. These greetings include the ability to automatically put the calls on hold and the ability to search for the next available call agent to handle the call while the people who call are listening to music on hold. You can create single or multiple call queues for your organization. See Create a Cloud call queue.

  • Voicemail – When you get a Phone System license for a user, that user is able to get voicemail that has been left by callers. Cloud Voicemail is automatically set up and provisioned for users after you assign a Phone System license and a phone number to them. See Set up Cloud Voicemail.

For more information about features, see Here’s what you get with Phone System in Office 365. If you’re ready to get started, see Set up Phone System in your organization.

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