I'm wondering, what do you mean by automating that part?

Do you mean an Apple shortcut that calls an API that would then call me

so all the calls would appear as inbound calls on my iPhone?

Or do you perhaps mean something else, my idea?

What is it to use a comma in a phone number to indicate a pause?

So I dial a number.

For example, instead of dialing John on 07-whatever,

I have every phone contact stored as the TISA number,

comma, comma, comma, to put three seconds of pauses.

So it gives time for the Twilio call to connect,

and then it automatically dials the keys.

Wouldn't that also work?