I hasten to add that D should be bypassed whenever From=UserA@<anywhere>, even when the source isn't *registered*.
A user's Cfwd might come from a SPA Gateway (or some other device), which isn't registered. For example I have several VoIP devices that can receive and forward calls (both phones and gateways), all with UserID=<my vox number>. But only one of them is actually registered to voxalot.
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