Is it possible for a tool to run at the same time as the assistant’s TTS output? What I want is to use the caller’s phone number to send an API request and retrieve related information simultaneously with the greeting (to reduce latency). and how can I access the phone number of the caller who initiated the call? thank you

Yes, use {{customer.number}} to get the caller’s phone number, and call a vapi tool function to fetch related info concurrently while the assistant delivers its TTS greeting to reduce latency..

@Kings_big💫 Does the dashboard support calling VAPI tool functions concurrently (in parallel)?

Yes, depending on the tool you can enable

async

on the tool settings, which will run the tool while the bot is speaking.