EKR wrote:

...
> I agree it's far from ideal. There are two possible solutions 
> to this sort of problem:
> 
> - Some sort of authenticated history mechanism that gives the gateway
>   confidence that the call was routed correctly

A different take on a solution (aimed at ssh and self-signed HTTP
certificates) is discussed at:
http://www.cs.cmu.edu/~dwendlan/perspectives/

-d

> - Enough UI to tell the user who *actually* answered the call.
> 
> Unfortunately, the second isn't available here because of the 
> lame PSTN UI.

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