I’m developing a Typescript app where I’ll make some phone calls using Twilio. My goal is to save the calls’ transcriptions.

I have built a Twilio call center which uses a TwiML app to deliver events to my PHP server. I’ve been monitoring the system over the last year and I am concerned that a few calls seem to arrive with invalid status. This seems to be a clear bug in the way that Twilio is handling inbound calls.

I am following the instructions from this question Register Multiple Webhooks for a Single Twilio Number.

In our backend, we are placing a call to multiple clients and everything works as intended, when the call completes the webhook is sent to our statusCallback URL as intended. From there, we are doing more work on the call and responding with Twiml with the intent to keep the call alive if nobody answers and play a message/etc. The endpoint is returning Twiml as intended but the call is dropping regardless. Not sure whats going on but any insight is appreciated.