### Answer I don't have specific documentation about a direct Boulevard integration with Retell AI. However, Retell AI supports connecting to scheduling platforms through a few approaches: 1. Custom Tool/Function Calling – You can create a custom function that calls Boulevard's API to check availability and book appointments. This would require building your own integration using Retell's tool calling capabilities. [(1) ]() 2. API Access – Retell offers API access allowing you to integrate with other key business applications and customize the solution to your specific needs. [(2) ]() For appointment booking, Retell has built-in preset tools for Cal.com (Check Availability and Book Appointment functions) . [(3) ]() For Boulevard specifically, you'd need to build a custom tool that interfaces with Boulevard's API. A community member mentioned using the Google API as an alternative approach for calendar integrations when built-in options don't fit the use case. [(4) ]() Recommended next steps: - Check Boulevard's API documentation for their scheduling endpoints - Build a custom function in Retell that calls those endpoints - Add the custom function to your agent's available tools Check out these potentially useful sources: - [AI Appointment Scheduling with Voice AI Booking Assistant]() - [AI Appointment Setter: Smart Scheduling & Follow-Ups]() Would you like a general answer on how to set up custom tool integrations in Retell?

​ To learn more, see the sources I considered: [[1] AI Appointment Setter: Smart Scheduling & Follow-Ups](https://www.retellai.com/ai-appointment-setter) [[2] AI for After-Hours Call Answering Services | Retell AI](https://www.retellai.com/blog/transforming-after-hours-call-answering-services-with-ai-phone-agents) [[3] AI Scheduling Assistant with Cal.com | Retell AI](https://www.retellai.com/blog/cal-coms-preset-tools) [[4] calendar appointment booking through retell](https://discord.com/channels/1186424376300679209/1250814023067500657) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.