top of page

Planning for Microsoft Teams Direct routing detailed

Teams Phone Overview :

Before we begin defining steps to plan for direct routing , this is an overview of teams phone :

1 -Core call Control and infra which is cloud based call control by teams phone PBX

2 - PSTN service provider and phone numbers : 3 choices ==> direct routing , Operator Connect , Microsoft calling plans.

3 - Devices and endpoints .

What is Direct routing :

Bring your own operator and infrastructure :

Directly route dial tone to Teams users

Connect SIP trunks directly from their network. Customers can work with their local Telecommunications provider to enable Microsoft Teams users to make and receive telephone calls. No porting required – Keep your numbers

Interoperability with 3rd party systems

Direct Routing allows customers with users in the Microsoft cloud to continue using 3rd party systems such as PBXs, Call Center, and Analog Telephony Adaptors (ATA) helping preserve key investments

Direct Routing benefits

Planning for Direct Routing :

Direct Routing considerations

Service numbers

Designed to handle high concurrency of calls

Call queues, auto attendant – supported through Direct Routing

Conferencing – not available through Direct Routing (except in GCC-H/DoD)

1.Dial in numbers are provided by the conferencing service (Microsoft numbers)

2.Dial back from a conference will be initiated from the conference bridge (not through Direct Routing)

Dynamic emergency calling

Available for Calling Plans and Direct Routing

Direct Routing requires additional emergency routing service provider:

See for deep-dive session

Emergency calling

Works different from traditional telephony

Direct Routing requires additional Emergency Routing Service Provider:

Need to acknowledge and provide notice to users

•Teams might not know the actual location of a caller

•If the user's device has no power, no calls will be possible

•Emergency calls should not be made if user is outside their office country/region

See for deep-dive session

Planning steps

Direct Routing deployment options

Direct Routing allows for Hosted SBC model and Multi-tenancy for scale

Customer premises model

The SBC is deployed at the customers premises

An SBC is connected only to one tenant

SBC hosting model

A carrier hosts an SBC in their datacenter / Azure

One SBC interconnected to one or many tenants

Self-deployed vs. hosted SBC

Direct routing allows for hosted SBC model

Allows partner to offer single or multiple SBCs with single certificate to multiple customers

Checklist for partners

Currently no certification program from Microsoft

Be sure you understand cost structure, support process, partner architecture and to test for quality

Customer self-deployment planning model

Requirements to each involved party:

!!!! the Configuration and support includes interaction between four entities: Microsoft, SBC vendor, customer support and consultants, carrier .

SBC hosting option 1: Carrier also provides the data services

Requirements to each involved party:

SBC hosting option 2: Carrier only provides the telephony

Requirements to each involved party:

Licensing and endpoints


Microsoft Teams Phone

Microsoft Teams + Skype for Business Plan 2, if included in licensing

Microsoft Audio Conferencing*

1.Required for adding external participants to scheduled meetings (dial in/dial out)

2.Ad-hoc conferencing behavior dictated by this license

Endpoint support

Any Teams client

Common area phones Skype for Business 3PIP phones ( for limitations)

Session Border Controllers (SBCs)

Network component providing:

Connectivity – allows Microsoft Teams to interconnect to other voice components [B2BUA]

Security – firewall for SIP traffic

Media services – transcoding, support for voice/video calls

Hope It gives you a larg idea about this offer .

123 views0 comments


bottom of page