I am fairly familiar with VoIP and I have my own VoIP PBX, and my provider is Twilio (for Voice) and CallCentric (for Fax). But How do providers like Twilio work exactly? More specifically:
- How do VoIP providers get DIDs?
- When I use my Cell Phone to call my DID on my VoIP SP, how does the cell phone provider know how to route the call to the correct DID?
- Is there a way to also look up the route that the DID should go to? Is it like a DNS Server?
- How can I tell who owns a DID?