TelcoBridges provides Session Border Controller (SBC) solutions designed for Managed Service Providers (MSPs) and Internet Service Providers (ISPs) to maintain reliable Microsoft Teams calling, shield networks from threats, and deliver the reliability customers expect. Deploy a carrier-grade SBC for Microsoft Teams on your own infrastructure, with subscription pricing starting at $1.25/session/year.
When clients depend on Microsoft Teams for calling, ProSBC equips MSPs and ISPs with a carrier-grade Session Border Controller for seamless Direct Routing. Acting as the secure bridge between the Teams cloud and the telephone network, ProSBC ensures exceptional voice quality, reliable SIP trunking, and external calling capabilities from anywhere. As the SBC for Microsoft Teams, ProSBC handles protocol translation, media encryption, and call routing so service providers can deliver Teams voice services without managing the complexity themselves.
ProSBC for Microsoft Teams delivers carrier-grade performance and robust security, ensuring exceptional voice quality and uninterrupted connectivity. Designed to handle demanding Teams Direct Routing environments, it provides the stability MSPs need to deliver dependable services their customers can trust. ProSBC scales from 500 to 60,000 concurrent sessions on a single instance, handling the SIP signaling normalization and media processing that Teams voice deployments require at carrier volumes.
Our pay-as-you-go subscription model provides service providers with predictable costs and maximum agility. ProSBC’s annual subscription starts at $1.25 per session per year, with the Teams Direct Routing add-on at $0.75 per session per year. Unlike hardware-bound SBC solutions that require large upfront investments, ProSBC for Teams integrates easily with third-party systems, letting you offer scalable, feature-rich solutions to your clients while keeping costs aligned with actual usage.
TelcoBridges provides fast, transparent, 24/7 carrier-grade support from engineers who understand SIP trunking and Teams Direct Routing deployments. From initial SBC deployment and SIP trunk configuration to ongoing optimization, our technical team ensures your Microsoft Teams SBC services run securely and efficiently. ProSBC Lab, a free permanent 3-session license with full Teams Direct Routing capability, lets you validate configurations before going live.
With over 20 years in telecom and deployments in 110+ countries, TelcoBridges is a trusted partner for MSPs and ISPs building Microsoft Teams voice practices. Our “no end-of-life” policy guarantees ongoing support, updates, and upgrades, so your Teams SBC investment is protected for the long term. Service providers can add Teams Direct Routing capability to an existing ProSBC deployment without replacing infrastructure or re-architecting their voice network.
Seamlessly connect Microsoft Teams with any VoIP network, third-party applications, or legacy telephony systems. ProSBC’s SIP header manipulation engine normalizes protocol differences between Teams and external carriers, handling codec negotiation and session timer handling across every trunk.
Operational high availability and carrier-grade reliability keep Teams voice services online even during network disruptions or peak call volumes. ProSBC’s active/standby redundancy ensures that if one Microsoft Teams SBC instance goes down, the standby takes over with minimal interruption to active calls.
TelcoBridges SBC for Teams protects your voice traffic with TLS and SRTP encryption, DDoS protection, dynamic blacklisting, and fraud prevention. Microsoft requires TLS for signaling and SRTP for media on all Direct Routing connections; ProSBC enforces both while also securing the carrier-facing side of every call.
Meet regulatory requirements, including STIR/SHAKEN caller ID authentication and other telecom mandates, while maintaining consistent, auditable call handling. ProSBC applies the correct attestation level per call, so MSPs handling mixed traffic types stay compliant without manual intervention.
TelcoBridges Session Border Controller for Teams provides flexible, rule-based call routing, allowing MSPs to quickly respond to changing customer needs and network demands. Route calls across multiple carriers based on cost, quality, or geography, and adjust routing policies through the API without downtime.
Continuous software updates, no forced migrations, and TelcoBridges’ “no end-of-life” policy ensure long-term value for Teams SBC deployments. Your Microsoft Teams SBC configuration carries forward through every update, so you never face a forced hardware refresh or a migration to a new platform.
24/7 expert technical support from TelcoBridges ensures MSPs have guidance whenever needed to maintain reliable and optimized Teams voice services. Our support engineers work directly on SIP trunk configuration, call routing issues, and Teams Direct Routing SBC troubleshooting, so problems get resolved by people who understand the platform.
Microsoft Teams handles internal chat, meetings, and screen sharing natively, but connecting Teams users to external phone numbers requires a Session Border Controller. A Microsoft Teams SBC serves as the gateway between the Teams cloud environment and the public switched telephone network (PSTN), translating between Microsoft’s protocols and the standard SIP signaling used by carriers worldwide.
Teams Direct Routing is Microsoft’s architecture for PSTN connectivity that gives service providers and enterprises full control over their voice infrastructure. Instead of purchasing Microsoft Calling Plans, organizations connect their own SIP trunks through a compatible SBC. The Teams Direct Routing SBC handles several functions simultaneously:
For MSPs and ISPs delivering Teams calling to multiple customers, a multi-tenant SBC architecture is essential. ProSBC supports up to 1,024 trunk groups (NAPs), allowing service providers to maintain separate call routing rules, security policies, and SIP trunk configurations for each customer from a single Microsoft Teams SBC instance. One SBC deployment can serve dozens or hundreds of end customers, each with their own carrier connections and call handling rules.
Per-tenant monitoring gives providers visibility into call quality metrics (MOS scores, jitter, packet loss) for each customer independently, supporting SLA commitments without dedicated hardware per tenant. ProSBC exposes these metrics through CDRs, SNMP, and a REST API, making it straightforward to integrate with existing monitoring platforms.
ProSBC runs as a software SBC on VMware, KVM, or Proxmox in your own data center, on AWS or Microsoft Azure for cloud-native architectures, or on bare-metal servers for maximum performance. An active/standby high availability configuration ensures that if the primary Teams Direct Routing SBC goes down, the standby takes over with minimal interruption. For service providers who prefer not to manage the SBC themselves, TelcoBridges offers a fully managed SBC service covering deployment, monitoring, and ongoing maintenance.
Organizations deploying an SBC for Microsoft Teams also need to address regulatory requirements. In North America, the FCC mandates STIR/SHAKEN caller ID authentication for voice calls. ProSBC integrates with STIR/SHAKEN signing and verification services at the SBC layer, applying the correct attestation level (A, B, or C) per call based on the traffic type. This is particularly important for MSPs handling mixed traffic: retail customers may require full attestation, while wholesale or gateway traffic receives partial attestation, all managed through a single SBC for Teams deployment.
Unlike traditional SBC appliances that require large upfront hardware investments, ProSBC uses an annual subscription starting at $1.25 per session per year. The Teams Direct Routing add-on costs $0.75 per session per year. For a 500-session deployment with Teams DR and 9×5 support, the total annual cost is $2,500. This OPEX model lets MSPs scale their Microsoft Teams SBC capacity up or down as their customer base grows, without the capital risk of traditional hardware SBC purchases.
ProSBC Lab provides a free, permanent 3-session license that includes full Teams Direct Routing capability. Service providers can validate their SIP trunk configuration, test call routing rules, and confirm interoperability with their carrier’s infrastructure before committing to a production license. The lab runs the same firmware as the production SBC, so configurations tested in the lab transfer directly to production without rework. This is particularly valuable for MSPs evaluating whether to add Microsoft Teams calling to their service portfolio: you can build and test the complete call flow, from Teams client through the SBC to the PSTN carrier, at no cost.
Service providers deploy a Microsoft Teams SBC to address several common scenarios. An MSP managing voice services for small and mid-size businesses typically connects a single multi-tenant ProSBC instance to one or more SIP trunk providers, then configures separate NAPs for each customer’s Teams tenant. Each customer gets their own phone numbers, call routing rules, and quality monitoring, while the MSP manages everything from one platform. An ISP bundling Teams calling with internet service uses the same architecture to add voice as a value-added service, differentiating their offering from competitors who provide connectivity alone.
Enterprises with existing on-premises PBX infrastructure use ProSBC to bridge their legacy phone systems with Teams. The SBC handles the SIP call flow translation between the PBX and Teams, allowing organizations to migrate to Teams calling at their own pace rather than replacing their entire telephony stack at once. In contact center environments, ProSBC connects Teams with CCaaS platforms and carrier SIP trunks simultaneously, routing customer calls to the right destination based on rules defined in the SBC’s routing engine.
Discover how TelcoBridges can help you ensure seamless and secure connectivity for Microsoft Teams voice deployments. Fill out the form below or call us at +1 450 903-8194 to arrange a consultation.
A Microsoft Teams Session Border Controller is the secure gateway that enables Teams users to make and receive external phone calls through Direct Routing. It connects Teams to SIP trunks or legacy phone systems, ensuring interoperability across carriers.
Yes, you can add it via the Customer Dashboard.
No, everything is the same, but we support all of the technical requirements demanded by Microsoft.
Session Border Controllers improve SIP trunking in Microsoft Teams by acting as the bridge between Teams and external SIP trunk providers. SBCs ensure compatibility by handling protocol normalization, codec transcoding, and SIP header manipulation, which allows seamless integration with different carriers and legacy systems. SBCs also add a layer of security to protect against toll fraud, denial-of-service attacks, and unauthorized access, while managing traffic to maintain call quality and reliability.
Setting up an SBC for Microsoft Teams can be quick or take a bit longer, depending on experience. An experienced user may complete the setup in as little as 20 minutes, while someone new to the process might need one to two days to review documentation, research, and work through the steps.
Microsoft Calling Plans bundle PSTN connectivity directly from Microsoft, with limited geographic availability and carrier choice. Direct Routing lets you connect your own SIP trunks through an SBC, giving you full control over carrier selection, call routing, and pricing. For MSPs and ISPs, Direct Routing is typically the preferred path because it preserves existing carrier relationships and allows multi-tenant SBC deployments that serve many customers from a single platform.
Yes. ProSBC acts as a B2BUA (back-to-back user agent) that fully terminates and re-originates SIP signaling on each side of the call. This means it can normalize the differences between Teams’ SIP implementation and the SIP dialects used by legacy PBX systems from vendors like Avaya, Cisco, and Mitel. The SBC handles SIP header translation, codec transcoding, and DTMF conversion so both sides communicate successfully.
Microsoft requires TLS (Transport Layer Security) for all SIP signaling and SRTP (Secure Real-time Transport Protocol) for media encryption on the Teams-facing connection. ProSBC enforces both, and it can also bridge between encrypted Teams connections and carriers that use standard unencrypted RTP on the PSTN side. This means you can meet Microsoft’s security requirements without needing every carrier to support SRTP.
A multi-tenant Microsoft Teams SBC allows MSPs to serve multiple customers from a single SBC instance. ProSBC supports up to 1,024 Network Access Points (NAPs), each with its own call routing rules, security policies, and SIP trunk configurations. Each tenant’s traffic is logically isolated, and per-tenant monitoring provides independent call quality metrics. This approach eliminates the need for dedicated SBC hardware per customer and simplifies management as the customer base grows.
ProSBC runs on VMware, KVM, Proxmox, AWS, Microsoft Azure, and bare-metal servers. You can deploy it in your own data center, in a public cloud, or use TelcoBridges’ managed SBC service if you prefer not to manage the infrastructure yourself. All deployment options support high availability with active/standby configurations, and configurations tested in the free ProSBC Lab transfer directly to production without rework.