Reply to post: Re: Spoofing ?

We're 90 per cent sure the FCC's robocall kill plan won't have the slightest impact

NullReference Exception

Re: Spoofing ?

Call forwarding.

Example: I have a VOIP system that, under certain conditions, will forward incoming calls to my cellphone. To forward the call, the VOIP system places a new outbound call to the cellphone and connects the incoming call to the new call. When it places the call to the cellphone, it uses the caller ID from the original incoming call (which, to the provider, is indistinguishable from spoofing.) This causes the caller ID of the original call to show up on the cellphone when it rings. Without the ability to "spoof" the caller ID when placing the call to the cellphone, all forwarded calls would show up on the cellphone as coming from the VOIP line, which would be... unhelpful. (No screening calls, no automatic lookup of the caller in your address book, no call history, etc.)

Pretty sure that all call forwarding works in a similar manner.

Being able to stop caller ID spoofing while still allowing calls to be forwarded with their original caller ID information would require a non-trivial amount of changes to infrastructure. (It's a similar situation as with SPF and email forwarding.)

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