CPaaS stands for Communications Platform as a Service.
CPaaS vendors offer customers the ability to add communication capabilities (voice, SMS, WebRTC) into their applications. By using a CPaaS vendor, companies need not invest in their own WebRTC infrastructure (STUN, TURN, signaling, and media servers).
What CPaaS provides
A typical CPaaS platform for WebRTC includes:
- Client SDKs: JavaScript, iOS, and Android libraries for adding voice/video to apps
- Media infrastructure: SFU / MCU servers, TURN servers, globally distributed
- Signaling servers: Room management, participant coordination
- PSTN connectivity: Phone number provisioning, SIP trunking
- Recording and storage: Cloud recording of calls
- APIs: REST APIs for session management, analytics, and billing
I sometimes refer to WebRTC-focused CPaaS providers as Video API vendors.
CPaaS vs building your own
Building WebRTC infrastructure in-house requires deep expertise in media servers, NAT traversal, codec optimization, and network engineering. CPaaS abstracts this complexity, offering:
- Faster time to market
- Global infrastructure without DevOps overhead
- Pay-per-use pricing
The tradeoff is less control over the media pipeline and ongoing per-minute costs that can become significant at scale.
