Twilio Voice

Sim's Twilio Voice integration adds 3 Twilio Voice tools and 1 real-time trigger to the AI agents you build in Sim's visual workflow builder — no code required. Make and manage phone calls. Teams often pair Twilio Voice with Rippling and SAP Concur in the same agent.

You can make Call, list Calls, and get Recording with Twilio Voice in Sim. Each runs as a tool inside an AI agent block, so an agent can chain Twilio Voice with services like Rippling and SAP Concur and apply LLM reasoning between steps.

Connecting Twilio Voice takes about five minutes: (1) Create a free account at sim.ai. (2) Create an agent in your workspace. (3) Drag a Twilio Voice block onto the workflow builder. (4) Paste your Twilio Voice API key to authenticate — you can find it in your Twilio Voice account settings. (5) Pick a tool such as "Make Call", wire up its inputs, and click Run — your agent is live.

Add a Twilio Voice block to your agent and select "Make Call" as the tool. Make an outbound phone call using Twilio Voice API. Fill in the required fields — inputs can reference outputs from earlier steps, such as text generated by an AI block or data fetched from another integration. No code is required.

Add a Twilio Voice trigger block to your agent and copy its generated webhook URL into Twilio Voice's webhook settings. Sim supports 1 real-time trigger for Twilio Voice: Twilio Voice Webhook. Once configured, every matching Twilio Voice event starts your agent instantly — no polling, no delay.

Sim receives the full event payload Twilio Voice sends — typically the record or object that changed, plus metadata like the event type and timestamp. For example, the "Twilio Voice Webhook" trigger fires when phone calls are received via Twilio Voice. Every field in the payload is available as a variable you can pass to AI blocks, conditions, or other integrations.