What Is SWML? Meet SignalWire’s Modern Call Flow Language

When it comes to real-time communications, flexibility and simplicity are key. That’s where SWML comes in.

See how SWML gives developers and businesses the ability to define call flows in a clean, readable format, using YAML or JSON, not legacy XML. Whether you’re creating basic IVRs or advanced AI-powered virtual assistants, SWML is designed to help you move faster, scale smarter, and build exactly what you need without unnecessary complexity.

Unlike traditional CPaaS tools that rely on clunky XML and complex voice webhooks, SWML provides a self-contained, declarative language for communication logic. It’s built on FreeSWITCH, one of the most trusted open source platforms in telecom, and is integrated directly into the SignalWire ecosystem.

Key Benefits:

• Write in YAML or JSON for better readability and modern tooling

• Define entire call flows in a single document—no more webhook juggling

• AI-ready: Easily create natural language IVRs and smart agents

• Built for security: Supports encrypted data transmission and secure AI interactions

• Scales with you: From support lines to virtual events with conferencing, it adapts to your needs

Use Cases Covered in the Video:

• AI-powered virtual assistants that gather info and perform tasks

• Smart call queues and dynamic routing based on caller input

• Secure data collection using SignalWire’s AI Gateway

• Custom multi-party conferencing flows