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Info
titleTenant Description
A tenant is used within the Microsoft environment to describe a single independent enterprise that has subscribed to Office 365 services; through this tenant, administrators can manage projects, users, and roles. 

Microsoft Teams Direct Routing Configuration

Consult the Microsoft documentation for the Direct Routing interface configuration guidelines, including the RFC standards and the syntax of SIP messages.

Anchor
SBC Config
SBC Config
SBC Configuration

Info

Support for an SBC behind a NAT is in SBC Edge 1000/2000 Release 8.0.2 and later only; support in SBC SWe Lite Edge is planned for a later release.

Obtain IP Address, FQDN & Public Certificate

Requirements for configuring the SBC Edge in support of Teams Direct Routing include:

Caption
0Table
1SBC Edge Requirements


RequirementDetails
SBC Behind the NAT*

Public IP address of NAT device and Private IP address of the SBC.

SBC with Public IPPublic IP address of SBC is required.
Network Address Translation (NAT)* ConfigurationRequired for deployment of an SBC behind a NAT.
Public FQDN The Public FQDN must point to the Public IP Address.
Public certificate associated with the Public FQDN

Certificate must be issued by one of the supported certification authorities (CAs). Wildcard certificates are supported.

Static IP Address

Required for deployment of an SBC behind a NAT, the Public IP address on the NAT must be static.

*NAT translates a public IP address to a Private IP address.


Anchor
DomainName
DomainName
Obtain Domain Name

The SBC FQDN must be from one of the Domain names registered in “Domains” of the Tenant. The table below lists Domain Name examples.

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Caption
0Table
1Domain Name Examples


Domain NameUse for SBC FQDN?FQDN Names - Examples
SonusMS01.com(tick)

Valid names:

  • aepsite6.SonusMS01.com

hybridvoice.org

(tick)

Valid names:

  • sbc1. hybridvoice.org
  • ussbcs15. hybridvoice.org
  • europe. hybridvoice.org

Non-Valid name:

sbc1.europe.hybridvoice.org (requires registering domain name europe. hybridvoice.org in “Domains” first)



Info

Users may be from any SIP domain registered for the tenant. For example, you can configure user user@SonusMS01.com with the SBC FQDN name sbc1.hybridvoice.org, as long as both names are registered for the tenant.

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Note
titlePrerequisite - Verify Domain Before Adding PSTN Gateway

Verify the correct domain name is configured for the Tenant. The correct domain name is required for the SBC to pair with Microsoft Teams.

  1. On the Microsoft Teams Tenant side, execute Get-CsTenant.
  2. Review the output.
  3. Verify that the Domain Name configured is listed in the Domains and DomainUrlMap attributes. If the Domain Name is incorrect or missing, the SBC will not pair with Microsoft Teams.

Anchor
Firewall
Firewall

Firewall Settings

The following section details the requirements for ports, protocols and services for firewalls in the path of Direct Routing calls.

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Note

Ribbon recommends the deployment of the SBC Edge product (including the SBC SWe LiteEdge) behind a firewall, within the DMZ, regardless of the assignment of a public IP to the SBC in question. Refer to to SBC Edge Portfolio Security Hardening Checklist for more information about the SBC and firewalls.


Anchor
nomedia
nomedia
Basic Firewall Settings for All Call Flows

Inbound Public (Internet to SBC)

  • SIP TLS: TCP 5061*

  • Media for SBC 1000: UDP 16384-17584**
  • Media for SBC 2000: UDP 16384-19384*
Outbound Public (SBC to Internet)

  • DNS: TCP 53

  • DNS: UDP 53

  • NTP: UDP 123

  • SIP TLS: TCP 5061

  • Media: UDP 49152-53247

Public Access Information

The tables below represent ACL (Access Control List) examples that protect the SBC Edge; these attributes are automatically provisioned if the Teams-related Easy Configuration wizards are used (applies to the greenfield deployment scenario only).

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Caption
0Table
1Public Access In - Requirements


Description

Protocol

Action

Src IP Address

Src Port

Dest IP Address

Dest Port

Outbound DNS Reply

TCP

Allow

0.0.0.0/0

53

SBC/32

0-65535

Outbound DNS Reply

UDP

Allow

0.0.0.0/0

53

SBC/32

0-65535

Outbound NTP Reply

UDP

Allow

0.0.0.0/0

123

SBC/32

123

Outbound SIP Reply

TCP

Allow

0.0.0.0/0

5061

SBC/32

1024-65535

Inbound SIP Request

TCP

Allow

0.0.0.0/0

1024-65535

SBC/32

5061*

Inbound Media Helper

UDP

Allow

52.112.0.0/14

49152-53247

SBC/32

16384-17584**

Deny All

Any

Deny

0.0.0.0/0


0.0.0.0/0




Caption
0Table
1Public Access Out - Requirements


Description

Protocol

Action

Src IP Address

Src Port

Dest IP Address

Dest Port

Outbound DNS Request

TCP

Allow

SBC/32

0-65535

0.0.0.0/0

53

Outbound DNS Request

UDP

Allow

SBC/32

0-65535

0.0.0.0/0

53

Outbound NTP Request

UDP

Allow

SBC/32

0-65535

0.0.0.0/0

123

Outbound SIP Request

TCP

Allow

SBC/32

0-65535

0.0.0.0/0

5061

Inbound SIP Reply

TCP

Allow

SBC/32

5061*

0.0.0.0/0

1024-65535

Outbound Media Helper

UDP

Allow

SBC/32

16384-17584**

52.112.0.0/14

49152-53247

Deny All

Any

Deny

0.0.0.0/0


0.0.0.0/0



* Define in Tenant configuration

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** Depends of the Media Port paired configured in SBC

Firewall Securing the SBC with Media Bypass

Apply the following firewall rules below:

Info

The Teams Client IP address cannot be predicted. As a result, allow Any IP (0.0.0.0/0).

Inbound Public (Internet to SBC) 

Media for SBC 1000: UDP 17586-21186**

Media for SBC 2000: UDP 19386-28386**

Outbound Public (SBC to Internet)

Media: UDP 50000-50019

If the device that handles the NAT between the Teams Client and SBC Public IP is performing PAT (Port Address Translation), verify that this device has the source port range of the Teams Client media or open all the ports from 1024 to 65535.

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For SBC not using NAT, there must be access between the firewall and the SBC's Public IP.

Public Access

The tables below represent ACL (Access Control List) examples that protect the SBC Edge; these ACL attributes are automatically provisioned if the Teams-related Easy Configuration wizards are used (applies to the greenfield deployment scenario only).

Caption
0Table
1Public Access In - Requirements (Media Bypass Scenario)


Description

Protocol

Action

Src IP Address

Src Port

Dest IP Address

Dest Port

Inbound Media Bypass Helper

UDP

Allow

0.0.0.0/0

1024-65535

SBC/32

16384-21186**



Caption
0Table
1Public Access Out - Requirements (Media Bypass Scenario)


Description

Protocol

Action

Src IP Address

Src Port

Dest IP Address

Dest Port

Outbound Media Bypass Helper

UDP

Allow

SBC/32

16384-21186**

0.0.0.0/0

1024-65535


* Define in Tenant configuration

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