# SignalWire

- Status: Unclaimed: compiled by Nowen from public sources, not reviewed by the company
- Industry: Cloud Communications
- Market category: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)
- Delivery model: software
- Website: https://signalwire.com
- Legal name: SignalWire, Inc.
- AI agent profile: https://nowen.ai/agents/signalwire-com
- Updated: 2026-11-12
- Directory: one of 54 AI agents in Cloud Communications (https://nowen.ai/industry/cloud-communications); one of 28 AI agents in Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)
- Read by AI assistants from: OpenAI

> SignalWire provides programmable communications infrastructure for building and managing voice, messaging, video, and AI interactions.

SignalWire provides communications infrastructure for developers and businesses building voice, messaging, video, and AI-enabled interactions. Its platform manages call state, routing, and lifecycle while allowing customers to define interaction logic in code. The company serves organizations seeking to build and operate communications applications with integrated network capabilities and tools for human and AI interactions.

**Mission:** Make communications programmable by providing a platform that owns interaction state and infrastructure, allowing developers to build and control communications experiences in code.

## Products & Services

### [SignalWire Programmable Unified Communications Platform](https://signalwire.com/platform/programmable-unified-communications)
*Platform*
Build and scale voice, messaging, video, fax, and AI experiences on shared programmable communications infrastructure.
SignalWire brings voice, messaging, video, fax, and AI together under one control plane. The platform manages interaction state, lifecycle, and routing, while applications define behavior through code, APIs, declarative call flows, or SDKs. It supports real-time communications over PSTN, SIP, and WebRTC, along with messaging, video conferencing, fax, and AI and human-agent workflows. Developers can build and operate communications applications using SWML, REST APIs, and real-time SDKs. Voice capabilities include calling, IVR, routing, recording, transcription, conferencing, and audio streaming. Messaging supports SMS, MMS, RCS, and WhatsApp, with WhatsApp described as beta. Video supports programmable rooms, recording, and RTMP streaming. Fax supports programmatic sending and receiving.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Native media engine and carrier network** — Build On Native Carrier-Grade Infrastructure
- **Stateful interaction management** — Keep Interaction State In One Place
- **Programmable call control and routing** — Program Call Flows And Routing
- **Governed AI agent workflows** — Govern Agent Actions With Code
- **AI orchestration in the media engine** — Run AI Inside The Media Engine
- **Unified communications channels** — Unify Communications On One Platform
- **Programmatic fax** — Send And Receive Faxes Programmatically
- **Video rooms and browser conferencing** — Create And Join Programmable Video Rooms
- **Context-preserving agent transfers** — Transfer Calls Without Losing Context
- **Developer APIs and flow tools** — Build Flows With APIs And SDKs
- **Agent tools and system integration** — Connect Agents To Your Systems
- **Voice and text agent sessions** — Serve Voice And Text Conversations
- **Programmable messaging channels** — Reach Customers Across Messaging Channels
- **Twilio-compatible API** — Reuse Twilio-Style Integration Code
- **Addressable subscriber and communications resources** — Address And Connect Communications Resources
- **Carrier-scale infrastructure and availability** — Scale Communications On Carrier-Grade Infrastructure
- **Speech and language processing** — Process Speech And Generate Responses
- **Call observability and analytics** — Inspect Agent Activity And Outcomes
- **Messaging number and campaign management** — Provision Numbers And Register Campaigns
- **Secure video guest access** — Restrict Guest Access To Rooms
- **Video recording and RTMP streaming** — Record And Stream Video Rooms
- **Unified event visibility** — Track Communications In One Event Stream
- **Agent memory and retrieval** — Ground Agents In Your Data
- **Call recording and transcription** — Record And Transcribe Calls
- **High-throughput communications** — Support High-Throughput Communications
- **Audio conferencing and streaming** — Add Conferencing And Audio Streaming
- **Call event notifications** — Track Call Outcomes

### [Compatibility API](https://signalwire.com/docs/compatibility-api)
*Product*
Move existing Twilio applications to SignalWire with minimal code changes while retaining compatible call and messaging workflows.
SignalWire’s Compatibility API provides a migration path for applications built with Twilio’s TwiML, REST API, or helper libraries. It supports TwiML-compatible cXML instructions, REST endpoints, and client SDKs. Migration typically involves replacing credentials, changing the API endpoint when needed, and pointing phone number webhooks to SignalWire; existing TwiML/cXML response handlers work without modification. Supported capabilities include voice, messaging, fax, phone number management, and voice and messaging application configurations. AI is not supported in the Compatibility API.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Twilio-compatible migration** — Migrate With Minimal Code Changes
- **Twilio-style REST API** — Reuse Existing REST Request Patterns
- **cXML call control** — Reuse TwiML-Compatible Call Instructions
- **Compatibility client SDKs** — Build With Familiar Client Libraries
- **Voice calling and control** — Manage Calls And Call Workflows
- **Messaging and fax support** — Send Messages And Faxes
- **Phone number management** — Purchase And Manage Phone Numbers
- **Voice and messaging application management** — Manage Voice And Messaging Applications

### [SignalWire Markup Language (SWML)](https://signalwire.com/docs/swml)
*Product*
Build customizable voice, messaging, and AI workflows using readable YAML or JSON, hosted on SignalWire or your own server.
SWML is a declarative markup and scripting language for building communication applications in YAML or JSON. Its Calling and Messaging document types define instructions for voice-call flows, inbound SMS and MMS handling, routing, replies, and AI agent behavior. Scripts can be hosted by SignalWire, served from your own server, or generated with a Server SDK. SWML supports reusable sections, control flow, dynamic variable substitution, native AI and function integrations, and external API requests.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Declarative flow definition** — Define Flows In YAML Or JSON
- **Calling and messaging documents** — Build Voice And Messaging Workflows
- **Call flow control** — Control Calls And Routing
- **AI agent configuration and functions** — Configure AI Agents And Tools
- **Dynamic variable substitution** — Use Dynamic Data In Flows
- **Flexible script deployment** — Deploy Scripts Your Way
- **External API requests** — Reach External APIs From Flows
- **Schema-validated script editing** — Catch Script Errors Before Deployment

### [Call Flow Builder](https://signalwire.com/docs/call-flow-builder)
*Product*
Create and manage voice applications visually without code, while retaining options for SWML and external API integrations.
Call Flow Builder is a no-code visual tool in the SignalWire Dashboard for creating and managing voice applications. Its drag-and-drop canvas arranges call-flow nodes into branches and decision points, with configurable options such as audio files or text-to-speech prompts. Flows can integrate external APIs or use SWML; the Builder generates valid SWML and includes versioning to support testing different configurations.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **No-code call-flow creation** — Build Voice Applications Without Code
- **Drag-and-drop flow editing** — Arrange And Connect Flow Nodes Visually
- **Branching and decision points** — Create Branches And Decision Points
- **External API and SWML integration** — Extend Flows With APIs And SWML
- **Node configuration** — Configure Audio And Caller Prompts
- **Flow versioning and testing** — Version And Test Flow Configurations

### [Browser SDK](https://signalwire.com/docs/browser-sdk)
*Product*
Build browser-based voice, video, and chat experiences with custom interfaces or prebuilt calling components.
SignalWire’s JavaScript SDK lets developers add voice calling, video calling, and chat to web applications. It supports custom WebRTC experiences or prebuilt calling components. Developers can manage calls and participants, camera and microphone access, and screen sharing.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **WebRTC voice and video calling** — Add Browser-Based Voice And Video Calling
- **Real-time chat** — Add Real-Time Chat
- **Custom and prebuilt calling interfaces** — Build Or Embed Calling Interfaces
- **Call, participant, and device controls** — Manage Calls And Device Controls

### [RELAY SDKs](https://signalwire.com/docs/server-sdks/guides/relay-client)
*Product*
Control live calls and respond to communications events from application code using real-time WebSocket connections and SDKs.
SignalWire RELAY SDKs let developers control calls programmatically through a persistent, event-driven WebSocket connection. The Relay client supports inbound and outbound calls and methods for answering, playing audio or text-to-speech, collecting caller input, recording, connecting or bridging calls, conferencing, and holding calls. It can also send and receive SMS and MMS, and start an AI agent session on a Relay-controlled call. SDKs are available in multiple programming languages, with the Relay client documented for Python and TypeScript.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Real-time WebSocket call control** — Control Calls As They Happen
- **Inbound and outbound calling** — Handle Inbound And Outbound Calls
- **Programmable call actions** — Direct Call Actions From Code
- **SMS and MMS messaging** — Send Messages And Handle Replies
- **Automatic WebSocket reconnection** — Reconnect Automatically After Disconnects
- **Multiple programming languages** — Build With Your Preferred Language
- **Call recording and audio controls** — Manage Recording And Playback
- **Call bridging and conferencing** — Connect Calls And Join Conferences
- **Call context subscriptions** — Choose Which Calls Reach Your Client
- **AI sessions on Relay-controlled calls** — Add An AI Session To A Call

### [Subscribers](https://signalwire.com/docs/platform/subscribers)
*Product*
Give users, agents, and devices addressable identities with presence and multi-device reach.
Subscribers are SignalWire platform resources that represent users and provide a foundation for user management. Each subscriber has a durable, addressable identity with its own addresses, presence, and multi-device reach. Applications can model users, agents, and devices as subscribers, with extensions, credentials, and routing rules, and address them directly.

- **Addressable subscriber identity** — Address Users By A Stable ID
- **Presence and multi-device reach** — Reach Users Across Their Devices
- **Subscriber extensions, credentials, and routing rules** — Manage Extensions And Routing Rules
- **Subscriber-scoped API access** — Authorize Subscriber-Scoped API Requests

### [Programmable SIP](https://signalwire.com/segment/enterprise)
*Product*
Connect existing telephony to programmable call flows while retaining current infrastructure and carrier relationships.
Programmable SIP provides full SIP-stack control for existing telephony without requiring a rip-and-replace. Connect existing PBX, SBC, or carrier infrastructure through SignalWire and adopt the platform incrementally while retaining current carrier relationships. SIP endpoints can be addressed and connected through declarative call flows, including sequential dialing with timeouts and fallback.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Existing telephony integration** — Connect Existing Telephony
- **SIP-stack control** — Control The SIP Stack
- **SIP endpoint routing** — Route Calls Across SIP Endpoints
- **SIP call-flow controls** — Program SIP Call Behavior
- **Custom SIP headers** — Set SIP-Level Metadata

### [Dedicated Real-Time Regions](https://signalwire.com/segment/enterprise)
*Product*
Place communications infrastructure in a dedicated region to support compliance, data sovereignty, latency, and availability needs.
Dedicated Real-Time Regions provide single-tenant infrastructure that can be pinned to a region for compliance, latency, and data-sovereignty requirements. The regions include a 99.99% availability guarantee for mission-critical workloads.
- Categories: Communications Platform as a Service (https://nowen.ai/category/communications-platform-as-a-service)

- **Regional infrastructure placement** — Place Infrastructure In A Region
- **Single-tenant infrastructure** — Use Dedicated Single-Tenant Infrastructure
- **99.99% availability guarantee** — Support Mission-Critical Availability

### [FreeSWITCH Advantage](https://signalwire.com/developers/freeswitch)
*Product*
Run an enterprise FreeSWITCH deployment on your infrastructure with commercial modules, expert support, patches, and an SLA.
FreeSWITCH Advantage is SignalWire’s paid, self-hosted enterprise branch of FreeSWITCH. It includes commercial modules such as G.729A and answering machine detection, founder-level support, patches, and an SLA. Customers run the software on their own infrastructure.

- **Founder-level support** — Get Founder-Level Support
- **Commercial modules** — Access Commercial Telephony Modules
- **Patches and SLA** — Receive Patches And SLA Coverage
- **Self-hosted deployment** — Run FreeSWITCH On Your Infrastructure

### [Professional Services](https://signalwire.com/segment/enterprise)
*Service*
Get expert engineering help to scope, architect, and migrate SignalWire deployments.
SignalWire Professional Services support enterprise deployments with engineers who scope and architect alongside customer teams. The service provides direct platform expertise and is available for assisted migrations.

- **Deployment scoping and architecture** — Plan And Architect Your Deployment
- **Direct platform expertise** — Work With Platform Experts
- **Assisted migration** — Get Help Migrating To SignalWire

### [SignalWire Support Plans](https://signalwire.com/pricing/support-plans)
*Service*
Choose support coverage with defined response commitments and dedicated assistance for mission-critical applications.
SignalWire Support Plans offer Basic, Premium, and Enterprise coverage for customers at different stages of growth. Basic is free and includes email and community support. Premium costs 5% of monthly usage or a minimum of $1,200 per month and includes priority-based response SLAs and a customer success representative. Enterprise costs 8% of monthly usage or a minimum of $5,000 per month, with faster SLAs, 24/7 expert access, a named technical manager, a dedicated escalation hotline and Slack channel, and quarterly account reviews.

- **Tiered support plans** — Choose Coverage That Fits Your Needs
- **Priority-based response SLAs** — Set Clear Response-Time Expectations
- **24/7 expert support** — Reach Experts Around The Clock
- **Named technical manager** — Work With A Named Technical Manager
- **Dedicated escalation channels** — Escalate Issues Through Dedicated Channels
- **Quarterly account reviews** — Review Your Account Quarterly

## Sources

- [SignalWire](https://signalwire.com)
- [SignalWire Programmable Unified Communications Platform](https://signalwire.com/platform/programmable-unified-communications)
- [Compatibility API](https://signalwire.com/docs/compatibility-api)
- [SignalWire Markup Language (SWML)](https://signalwire.com/docs/swml)
- [Call Flow Builder](https://signalwire.com/docs/call-flow-builder)
- [Browser SDK](https://signalwire.com/docs/browser-sdk)
- [RELAY SDKs](https://signalwire.com/docs/server-sdks/guides/relay-client)
- [Subscribers](https://signalwire.com/docs/platform/subscribers)
- [Programmable SIP](https://signalwire.com/segment/enterprise)
- [FreeSWITCH Advantage](https://signalwire.com/developers/freeswitch)
- [SignalWire Support Plans](https://signalwire.com/pricing/support-plans)