-You forward your office phone to your cell phone. You want the number of the original person calling to show up on your cell phone. This means that the office phone system needs to spoof the original caller's phone number. This could be a local call, an overseas call, etc.
This is not a simple update issue. How does the telco know that this is a legitimate spoof? Further, if this is blocked and the number is rewritten to the billing telephone number, the client will complain that they are answering outside calls, thinking it is their office calling.
-How the carriers are integrated, how do they trust the incoming call info from another carrier? Blacklists and whitelists are impossible to keep up as scammers are randomizing the data.
This is an expensive problem, and one that carriers would love to solve - there isn't a lack of incentive either. I've seen a few solutions out there, but I am not convinced they work as advertised.
