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Watch the following session to learn about the benefits of Direct Routing, how to plan for it, and how to deploy it: Direct Routing in Microsoft Teams

Microsoft Phone System Direct Routing lets you connect a supported, customer-provided Session Border Controller (SBC) to Microsoft Phone System. With this capability, for example, you can configure on-premises Public Switched Telephone Network (PSTN) connectivity with Microsoft Teams client, as shown in the following diagram:

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Note

Skype for Business Online also lets you pair a customer-provided SBC, but this requires an on-premises Skype for Business Server deployment or a special edition of Skype for Business, called Cloud Connector, in between the SBC and the Microsoft Cloud. This scenario is known as hybrid voice. In contrast, Direct Routing allows a direct connection between the supported SBC and the Microsoft Cloud.

Important

Cloud Connector Edition will retire July 31, 2021 along with Skype for Business Online. Once your organization has upgraded to Teams, learn how to connect your on-premises telephony network to Teams using Direct Routing.

With Direct Routing, you can connect your SBC to almost any telephony trunk or interconnect with third-party PSTN equipment. Direct Routing enables you to:

Use virtually any PSTN trunk with Microsoft Phone System.
Configure interoperability between customer-owned telephony equipment, such as a third-party private branch exchange (PBX), analog devices, and Microsoft Phone System.

Microsoft also offers all-in-the-cloud voice solutions, such as Calling Plan. However, a hybrid voice solution might be best for your organization if:

Microsoft Calling Plan is not available in your country.
Your organization requires connection to third-party analog devices, call centers, and so on.
Your organization has an existing contract with a PSTN carrier.

Direct Routing also supports users who have the additional license for the Microsoft Calling Plan. For more information, see Phone System and Calling Plans.

With Direct Routing, when users participate in a scheduled conference, the dial-in number is provided by Microsoft Audio Conferencing service, which requires proper licensing. When dialing out, the Microsoft Audio Conferencing service places the call using online calling capabilities, which requires proper licensing. (Note if a user does not have a Microsoft Audio Conferencing license, the call routes through Direct Routing.) For more information, see Online Meetings with Teams.

Planning your deployment of Direct Routing is key to a successful implementation. This article describes infrastructure and licensing requirements and provides information about SBC connectivity:

For detailed information about configuring Direct Routing, see Configure Direct Routing.

Infrastructure requirements

The infrastructure requirements for the supported SBCs, domains, and other network connectivity requirements to deploy Direct Routing are listed in the following table:

Infrastructure requirement	You need the following
Session Border Controller (SBC)	A supported SBC. For more information, see Supported SBCs.
Telephony trunks connected to the SBC	One or more telephony trunks connected to the SBC. On one end, the SBC connects to the Microsoft Phone System via Direct Routing. The SBC can also connect to third-party telephony entities, such as PBXs, Analog Telephony Adapters, and so on. Any PSTN connectivity option connected to the SBC will work. (For configuration of the PSTN trunks to the SBC, please refer to the SBC vendors or trunk providers.)
Microsoft 365 or Office 365 organization	An Microsoft 365 or Office 365 organization that you use to home your Microsoft Teams users, and the configuration and connection to the SBC.
User registrar	User must be homed in Microsoft 365 or Office 365. If your company has an on-premises Skype for Business or Lync environment with hybrid connectivity to Microsoft 365 or Office 365, you cannot enable voice in Teams for a user homed on-premises. To check the registrar of a user, use the following Skype for Business Online PowerShell cmdlet: `Get-CsOnlineUser -Identity <user> \| fl HostingProvider` The output of the cmdlet should show: `HostingProvider : sipfed.online.lync.com`
Domains	One or more domains added to your Microsoft 365 or Office 365 organizations. Note that you cannot use the default domain, *.onmicrosoft.com, that is automatically created for your tenant. To view the domains, you can use the following Skype for Business Online PowerShell cmdlet: `Get-CsTenant \| fl Domains` For more information about domains and Microsoft 365 or Office 365 organizations, see Domains FAQ.
Public IP address for the SBC	A public IP address that can be used to connect to the SBC. Based on the type of SBC, the SBC can use NAT.
Fully Qualified Domain Name (FQDN) for the SBC	A FQDN for the SBC, where the domain portion of the FQDN is one of the registered domains in your Microsoft 365 or Office 365 organization. For more information, see SBC domain names.
Public DNS entry for the SBC	A public DNS entry mapping the SBC FQDN to the public IP Address.
Public trusted certificate for the SBC	A certificate for the SBC to be used for all communication with Direct Routing. For more information, see Public trusted certificate for the SBC.
Connection points for Direct Routing	The connection points for Direct Routing are the following three FQDNs: `sip.pstnhub.microsoft.com` – Global FQDN, must be tried first. `sip2.pstnhub.microsoft.com` – Secondary FQDN, geographically maps to the second priority region. `sip3.pstnhub.microsoft.com` – Tertiary FQDN, geographically maps to the third priority region. For information on configuration requirements, see SIP Signaling: FQDNs.
Firewall IP addresses and ports for Direct Routing media	The SBC communicates to the following services in the cloud: SIP Proxy, which handles the signaling Media Processor, which handles media -except when Media Bypass is on These two services have separate IP addresses in Microsoft Cloud, described later in this document. For more information, see the Microsoft Teams section in URLs and IP address ranges.
Media Transport Profile	TCP/RTP/SAVP UDP/RTP/SAVP
Firewall IP addresses and ports for Microsoft Teams media	For more information, see URLs and IP address ranges.

Licensing and other requirements

Users of Direct Routing must have the following licenses assigned in Microsoft 365 or Office 365:

Microsoft Phone System.
Microsoft Teams + Skype for Business Plan 2, if included in licensing.
Microsoft Audio Conferencing (please read the notes and the paragraph below for specific examples about when the license is required).

Note

Skype for Business Plan should not be removed from any licensing agreement where it is included.

Important

GCC High and DoD users should disable any Audio Conferencing licensing included in G5 and wait to enable any Audio Conferencing until Direct Routing has been fully configured. Users should have dial-in phone numbers configured and a working dial pad before enabling Audio Conferencing licenses. See Audio Conferencing with Direct Routing for GCC High and DoD for more details.

Important

In the case that you would like to add external participants to scheduled meetings, either by dialing out to them or by providing the dial-in number, the audio conferencing license is required.For GCC High and DoD, do not assign an Audio Conferencing license for G5 users. For G3 users,

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