Twilio SMS integration

I have followed the instructions you provided here https://vapi.ai/blog/vapi-sms-launch-twilio

Integrated our Twilio phone number via VAPI.
Our twilio phone number is registered for A2P
We created the SendTextTool.
Our assistant is linked to the Send Text tool
It is included in the system prompt.

We are able to send SMS messages from the assistant but none of the responses are getting back to VAPI.

In our Tests Twilio is receiving the SMS message.

I temporarily changed Twilio webhook when a message received from your api to this test Webhook and it appears to be sending data from Twilio fine. https://webhook.site/
It seems to me that either Twilio is not sending the correct structure to VAPI or something is failing on your end. Would you be able to give me an update on what is going on?
Read Add SMS to Your Vapi Agents on the Vapi blog
Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails
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