Azure Communication Services
The ACS Call App is a fully brandable add-on to the TeamMate PBX Connector that bridges your existing phone system with Microsoft Teams. Built on Microsoft’s Azure Communication Services (ACS) Calling SDK, it delivers crystal-clear VoIP voice and video calls federated directly into the Teams environment — no Direct Routing, no Phone Resource Accounts, and no Phone System licenses required.
Why the ACS Call App
Stop paying $10/user/month for Phone System licensing. The ACS Call App uses Microsoft's own ACS platform to deliver VoIP calling, so your users make and receive calls inside Teams with no additional Microsoft licenses.
SIP federation handles the VoIP handoff between your PBX, UCaaS, or CCaaS and Teams. No Direct Routing configuration. No Phone Resource Accounts. Just plug in and go.
Calling, chat, and SMS consolidated into a single Teams app. Your team sees presence, escalates calls to video, and collaborates across platforms without switching tools.
ACS's pay-as-you-go model means you only pay for what you use. Scales from a single office to thousands of seats with Azure's global infrastructure and enterprise-grade security.
AAD authentication, end-to-end encryption, and data residency compliance included. Minimal Microsoft permissions — no passwords or tokens read or stored.
Fully compliant with Microsoft's tightened Graph API policies effective September 30, 2025. Uses pure ACS APIs — no transfer bots, no legacy dependencies. Auto-updates via ACS SDKs.
User Experience
Initiate and receive VoIP calls right inside Teams with a polished, fluent UI that feels built-in.
External PBX, UCaaS, and CCaaS users join Teams meetings via link with full video, audio, and chat.
Inbound call alerts appear as Teams system notifications so you never miss a call.
TeamMate's Chat and SMS Connectors are unified into the ACS Call App, so users communicate with non-Teams colleagues from one place.
Server-side call queues, transfers, and IVR workflows keep contact centers running smoothly.
White-label the entire experience for your customers — your brand, your portal, your Teams app.
Side By Side
| Feature | ACS Call App | Microsoft Phone System |
|---|---|---|
| Microsoft License Required | None | Teams Phone license ($10/user/mo) |
| External PBX/Ucaas/Ccaas Integration | Native SIP federation – connect in minutes | Requires Direct Routing or Operator Connect |
| Direct Routing Required | No | Yes (for external systems) |
| Phone Resource Accounts | Not needed | Required for call queues & auto-attendants |
| VoIP Calling in Teams | Full support via ACS SDK | Full support via Phone System |
| Video Calling | Supported | Supported |
| Chat & SMS Integration | Built-in (unified app) | Separate configuration required |
| Federated Meetings | External users join via link | Requires guest access or PSTN dial-in |
| Call Queues & IVR | Server-side via TeamMate | Requires Phone Resource Accounts |
| Presence & Availability | Visible across platforms | Teams-native only |
| White-Label for Providers | Fully brandable | Not available |
| Pricing Model | Pay-as-you-go (ACS) | Per-user/month subscription |
| Graph API Compliance (Sept 2025) | Fully compliant – no transfer bots | N/A (native Microsoft) |
| Setup Complexity | Low – minutes to deploy | Moderate to high |
On The Roadmap
Share your screen during federated calls between Teams and external platforms.
Deeper cross-platform chat capabilities for real-time collaboration beyond voice.
FAQs
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Teams Handle is a platform designed to help businesses manage their teams, tasks, and communication in one place. It simplifies collaboration.
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