SignalWire AI Agent API

SignalWire AI Agent API runs voice-agent logic inside SignalWire's communications control plane. Developers can build AI IVRs and phone agents with prompts, tools, call state, SIP and PSTN, messaging, deterministic controls, failover, and an open-source Python SDK.

Editorial research · Reviewed Jul 10, 2026

Test the agent live

Official product page includes the vendor-hosted Sigmond Voice AI demonstration.

Open the live demo

Quick facts

Platform type

Developer API

Inbound calls

Yes

Outbound calls

Yes

Human handoff

Yes

Setup difficulty

Technical

Pricing model

Usage-based AI, telephony, number, model, and optional service costs

Developer friendly

Yes

Pricing details

SignalWire pricing is component-based across AI, telephony, phone numbers, messaging, recording, and selected models. Verify current product pricing for the chosen geography and stack.

Integrations

PSTNSIPWebRTCSignalWire Markup LanguagePython Agents SDKMCPCustom APIs

Data and permissions

Voice agents may talk to customers, access records, record calls, and trigger external actions.

Can read customer data

Can write or update external systems

Can send messages

Can trigger workflows

Requires API keys

Records calls

Human approval available

Use scoped project tokens, authenticated webhooks, deterministic tool exposure, redacted DTMF for sensitive data, recording consent, telecom registration, and strict outbound authorization.