Microsoft Teams Direct Routing

Seamlessly and securely connect Microsoft Teams users to PSTN service providers

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      Superior security protection against attacks, including DDoS, fuzzing or malformed packet attacks 

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      Support for HD codecs, efficient transcoding, Comfort Noise (CN), silence suppression and voice quality-based routing allows intelligent voice service delivery  

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      Extensive interoperability capabilities, SIP and SDP message manipulation

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    Support for multi-tenancy enables onboarding multiple enterprises on a single SBC instance

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    Provides real-time analytics, troubleshooting and triaging

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    Built on cloud native carrier-class virtualized Perimeta session border controller


Direct Routing (DR) allows interconnection of PSTN trunks with Microsoft Phone  Systems enabling calls between Teams users and PSTN users. Additionally, DR provides interoperability between customer-owned telephony equipment and CSP Application Server, IMS Core, and Microsoft Teams Phone System.

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Perimeta DR certification means you can now leverage the flexibility, security, robustness and scalability inherently available on Perimeta when implementing DR to PSTN service provider SIP trunks. 

  • Supports Teams media codec transcoding
  • Robust security
  • Extensive interworking capabilities
  • Comfort Noise (CN) and silence suppression
  • Software portability for public and private cloud or on-premises
  • Deployment flexibility via combined or distributed session and media plane
  • Automation and Orchestration
  • Real-time troubleshooting, triaging and voice quality monitoring (VQM)
  • Ringback tones support
  • Built-in support for multi-tenancy
  • Integrate Teams Phone System with other PBX and Hosted UC users

Lean more about the Perimeta Session Border Controller

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Why use Metaswitch’s Perimeta SBC for Microsoft Teams Direct Routing?  

Connecting Microsoft Teams with a service provider's PSTN network using a Direct Routing SBC can create challenges in terms of deployment model, security, configuration, interworking and interoperability. Perimeta SBC solves all these problems, while making your investment future-proof for a multitude of use-cases.

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Perimeta meets the challenges of today's networks with capabilities that deliver sophisticated network security, advanced management of packet throughput under all load conditions, extensive protocol interworking and normalization, and complete packet analysis for in-depth problem isolation and repair. 

Supports decomposed signaling and media functions: Allows dynamic scaling of signaling and media traffic independently and on-demand that can lead to a threefold increase in efficiency. 

Encryption, authentication and dynamic blacklisting: Superior protection against attacks, including DDoS, fuzzing or malformed packet attacks. 

Unparalleled voice quality experience: Support for HD codecs and efficient transcoding, Comfort Noise (CN), silence suppression, voice quality-based routing allows customers to deliver voice intelligently. 

Extensive interoperability capabilities: Support for robust MMF (Message Manipulation Function) simplifies communication between different networks and endpoints. Enables multiple types of networks, protocols, and devices to work together seamlessly. 

Real-time analytics, troubleshooting and triaging: Network operators can quickly identify and resolve issues with audio and signaling using voice quality metrics (VQM), including packet loss, jitter, delay and MOS.  These metrics also allow you to continually track your performance against crucial key performance indicators (KPIs). 

Multi-purpose SBC: Perimeta’s flexibility makes it the only and the last SBC you will need. It meets myriad needs for enterprises and carriers, including Microsoft Teams DR, Access SBC (whether in NGN or IMS networks), SIP Interconnect and VoLTE NNI (IBCF/TrGW). 

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