Get API credentials from Dentrix β usually an API key or OAuth client from your account or your IT team.
In Retell, open your agent and go to Functions β Add custom function.
Enter the endpoint URL and method, and add your credentials as headers.
Define the parameters the agent should collect from the caller and pass through.
Write the description that tells the agent when to call the function β this is what the model uses to decide.
Test it in the LLM playground, check the response parses, then publish.
After-hours call β agent checks open slots via your Dentrix endpoint β books the appointment β confirms by SMS
Healthcare teams that would rather not build this themselves can use Keragon, a HIPAA-ready automation platform with a native Retell connector.












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