Inbound Webhook to Retell AI from Make

Questions
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1

:bullseye: What is your goal?

I am a 787 pilot and often airborne for 15 hours. I have a side hustle as a mortgage broker and I am trying to create an AI Voicemail Agent on Retell that will answer my phone and let the borrower or realtor know that I am currently airborne for the next 15 hours.

:thinking: What is the problem & what have you tried?

I have the webhook setup in Make to check my Google calendar to see if I am flying, pull the flight data (flight number, cities, ETA) and then generate a webhook to export that data as dynamic variables to Retell. However Retell doesn’t seem to recognize these dynamic variables no matter what I do. I have been using ChatGPT to try and do my coding but it must be missing something. Retell does not seem to see the dynamic variables I’ve created

:camera_with_flash: Screenshots (scenario flow, module settings, errors)

Screenshot 2026-01-15 at 3.08.26 PM.png
Screenshot 2026-01-15 at 3.08.26 PM.png1630Ă—1324 208 KB

3

Hello @Elliott_Bowman !

Welcome to the Community!

I think the solution to your problem is simple.

Retell most likely expects correct headers. By default, they are empty.

To do this:

  1. Toggle on Advanced settings in your webhook response module:

Simplymation_1
Simplymation_11278Ă—1002 64.6 KB

  1. Add the following header:

Key: Content-Type
Value: application/json

Simplymation_2
Simplymation_2886Ă—654 32.3 KB

Please let me know if that helps!

Have a nice day!
Michał

4

Sorry I should have mentioned, I already had done that according to ChatGPT’s instructions. It just seems like Retell AI is not recognizing these dynamic variables. Any tips on how to get them recognized clearly?

5

Have you defined response variables?

Step no. 8:

It uses dot notation, in you case for example:

Key: is_airborne

Value dynamic_variables.is_airborne

3 Likes
6

This fixed it, thank you so much for your help!

3 Likes
7

Great to hear that!

Please, mark your question as solved :slight_smile:

1 Like