It's a shame, because if this kind of thing had caught on, VoIP calls could be substituted for PSTN calls and the user wouldn't have to notice. Imagine calling

It's a shame, because if this kind of thing had caught on, VoIP calls could be substituted for PSTN calls and the user wouldn't have to notice. Imagine calling amazon.com and getting their customer support line either via PSTN or via VoIP (provided you/they have e.g. SIP accounts, which obviously isn't a good assumption now but would sure be an easier transition in this hypothetical world). Even better: imagine being able to set reverse DNS in this scenario. I call someone who doesn't have me in their address book, and their phone shows "<my nickname>.tel".