How will delegation be handled? Right now, I guess I'm "spoofing" my caller ID by using a VoIP service unrelated to my actual phone provider to make outbound c

How will delegation be handled? Right now, I guess I'm "spoofing" my caller ID by using a VoIP service unrelated to my actual phone provider to make outbound calls. My phone provider has every incentive to sabotage this, since this alternative provider allows me to pay probably something like 1% of the rates I'd be paying to my regular provider. The VoIP provider verifies that I own the number before letting me use it as caller ID, but towards the network it still relies on the ability to send arbitrary caller IDs. Will this remain possible/will providers controlling someone's phone number be required to somehow enable this? How will this work for call centers that want to send a central well-publicized inbound number from multiple locations? Edit: So I read up on the protocol The SIP provider will provide a claim, signed with their key, confirming that they checked my number. This leaves the possibility of providers having bypassable checks (I think mine e.g. let you set an arbitrary caller ID if you edited a HTML dropdown client-side) and "how to identify which provider is trustworthy", but that seems a lot easier to solve than the original problem.