I want to double confirm - when a number is imported from Twilio it stays in Twilio right - it is not a port, or migrating it out of the Twilio SID? So in other words my number will still function in my existing system this is just a method of VAPI leveraging the number? We have a super high volume of calls that run through this number...so I don't want to accidentally disconnect it from our system.

Yup, that correct!