The communications
control plane

Compose AI agents, human agents, and real-time communications into one system you control in code. One programmable platform for everything that happens on a call. Built by the creators of FreeSWITCH.

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Trusted by forward-thinking companies

ARCHITECTURE

Production is a costly place to discover architectural mistakes

In staging, webhooks arrive fast and in order. Production is less polite. On SignalWire, state lives inside the call so that your code defines logic instead of managing event timing. The same architecture that works at 10 calls works at 10,000.

Traditional CPaaS

Telephony vendor + WebRTC vendor + AI vendor

Your responsibility to rebuild state from events

Endless race conditions

Rogue AI that won’t stay on task

Bolted on AI adds latency

Platform

One Programmable Unified Communications platform

Calls are first-class objects with state attached

The developer is in full control of call behavior

AI Agents follow code logic and stay on task

AI Kernel directly in the media stack for lowest latency

THE CODE

One engine. Fully programmable.

The platform handles state, timing, coordination, and infrastructure. You build AI agents and call flows, so your code spends its time on your product instead of the plumbing.

IVR and Call Routing

AI Voice Agents

Contact Center

01 Route by AI Voice

Get the DTMF out of here. The caller says what they need and the flow routes on it.

02 Route by Who’s Calling

Look the caller up and route on account, tier, or history. The lookup and the decision live in one flow, no orchestration layer between them.

03 Answering Machine Detection

Tell human, machine, and fax apart on outbound calls and branch on the result. It's a native verb, not a service you integrate and reconcile.

Route by AI Voice

copy

version: 1.0.0
sections:
  main:
    - prompt:
        play: ["say: In a few words, what are you calling about?"]
        # Speech in, not digits. What they say becomes the route.
        speech_language: en-US
        speech_hints: ["sales", "support", "billing"]
    - switch:
        variable: prompt_value
        case:
          sales:
            - connect: { to: "+15551112222" }
          support:
            - connect: { to: "+15553334444" }
          default:
            - connect: { to: "+15555556666"

IVR and Call Routing

AI Voice Agents

Contact Center

01 Route by AI Voice

Get the DTMF out of here. The caller says what they need and the flow routes on it.

02 Route by Who’s Calling

Look the caller up and route on account, tier, or history. The lookup and the decision live in one flow, no orchestration layer between them.

03 Answering Machine Detection

Tell human, machine, and fax apart on outbound calls and branch on the result. It's a native verb, not a service you integrate and reconcile.

Route by AI Voice

copy

version: 1.0.0
sections:
  main:
    - prompt:
        play: ["say: In a few words, what are you calling about?"]
        # Speech in, not digits. What they say becomes the route.
        speech_language: en-US
        speech_hints: ["sales", "support", "billing"]
    - switch:
        variable: prompt_value
        case:
          sales:
            - connect: { to: "+15551112222" }
          support:
            - connect: { to: "+15553334444" }
          default:
            - connect: { to: "+15555556666"

IVR and Call Routing

AI Voice Agents

Contact Center

01 Route by AI Voice

Get the DTMF out of here. The caller says what they need and the flow routes on it.

02 Route by Who’s Calling

Look the caller up and route on account, tier, or history. The lookup and the decision live in one flow, no orchestration layer between them.

03 Answering Machine Detection

Tell human, machine, and fax apart on outbound calls and branch on the result. It's a native verb, not a service you integrate and reconcile.

Route by AI Voice

copy

version: 1.0.0
sections:
  main:
    - prompt:
        play: ["say: In a few words, what are you calling about?"]
        # Speech in, not digits. What they say becomes the route.
        speech_language: en-US
        speech_hints: ["sales", "support", "billing"]
    - switch:
        variable: prompt_value
        case:
          sales:
            - connect: { to: "+15551112222" }
          support:
            - connect: { to: "+15553334444" }
          default:
            - connect: { to: "+15555556666"

IVR and Call Routing

Built from the media engine up

The same team created FreeSWITCH, the media engine much of the industry runs on, then spent two decades building the platform around it, down to the carrier. Because we own that layer, the control plane goes all the way down. You're programming the network itself, not a wrapper over someone else's.

Start building

SYSTEM-DIRECTED AI

You write the logic. Voice AI follows it.

Putting business logic in a prompt means hoping the model stays on script. With a control plane, AI agents can only act on what you explicitly expose at each step. The same layer governs every call, so routing, media, and AI all run under logic you control.

CUSTOMER PROOF

Join the thousands of developers

“It took us maybe a day to get a proof of concept working. ”
Mark Lilien
CTO at Textline
“I was able to develop and ship the first version within 6 hours. Within 24 hours customers were signing up.”
David Plappert
Founder at PhoneLiveStreaming
“We really appreciate the carrier-grade quality of service.”
Murray Kawchuk
Head of Strategy at Conversate

“It took us maybe a day to get a proof of concept working. ”
Mark Lilien
CTO at Textline
“I was able to develop and ship the first version within 6 hours. Within 24 hours customers were signing up.”
David Plappert
Founder at PhoneLiveStreaming
“We really appreciate the carrier-grade quality of service.”
Murray Kawchuk
Head of Strategy at Conversate

For Developers

Dive into documentation

From pip install to production. Guides, API references, and SDKs to start building complex communications flows.

Communications Platform

AI Voice Agents

SWML

Define voice, video, messaging, and AI flows in JSON or YAML. Built-in methods for every call primitive, served statically or generated per request.

Learn More

REST APIs

Every capability is a REST call: send an SMS, place a call, provision a number. Twilio-compatible, so existing code runs once you swap the credentials.

Learn More

Realtime SDKs

Control calls in real time over WebSocket with the RELAY SDKs. React to call events as they happen, in the language you already use.

Learn More

For Developers

Dive into documentation

From pip install to production. Guides, API references, and SDKs to start building complex communications flows.

Communications Platform

AI Voice Agents

SWML

Define voice, video, messaging, and AI flows in JSON or YAML. Built-in methods for every call primitive, served statically or generated per request.

Learn More

REST APIs

Every capability is a REST call: send an SMS, place a call, provision a number. Twilio-compatible, so existing code runs once you swap the credentials.

Learn More

Realtime SDKs

Control calls in real time over WebSocket with the RELAY SDKs. React to call events as they happen, in the language you already use.

Learn More

For Developers

Dive into documentation

From pip install to production. Guides, API references, and SDKs to start building complex communications flows.

Communications Platform

AI Voice Agents

SWML

Define voice, video, messaging, and AI flows in JSON or YAML. Built-in methods for every call primitive, served statically or generated per request.

Learn More

REST APIs

Every capability is a REST call: send an SMS, place a call, provision a number. Twilio-compatible, so existing code runs once you swap the credentials.

Learn More

Realtime SDKs

Control calls in real time over WebSocket with the RELAY SDKs. React to call events as they happen, in the language you already use.

Learn More

One platform for everything on the call

One platform for voice, AI, and messaging, on infrastructure that runs all the way down to the carrier. Every part of the call, programmable from one place.

Start building

Dive into docs

One platform for everything on the call

One platform for voice, AI, and messaging, on infrastructure that runs all the way down to the carrier. Every part of the call, programmable from one place.

Start building

Dive into docs

One platform for everything on the call

One platform for voice, AI, and messaging, on infrastructure that runs all the way down to the carrier. Every part of the call, programmable from one place.

Start building

Dive into docs

One platform for everything on the call

One platform for voice, AI, and messaging, on infrastructure that runs all the way down to the carrier. Every part of the call, programmable from one place.

Start building

Dive into docs

The communicationscontrol plane

Production is a costly place to discover architectural mistakes

Traditional CPaaS

Platform

One engine. Fully programmable.

Built from the media engine up

You write the logic. Voice AI follows it.

You write the logic. Voice AI follows it.

Join the thousands of developers

Dive into documentation

SWML

REST APIs

Realtime SDKs

Dive into documentation

SWML

REST APIs

Realtime SDKs

Dive into documentation

SWML

REST APIs

Realtime SDKs

One platform for everything on the call

One platform for everything on the call

One platform for everything on the call

One platform for everything on the call

The communications
control plane