said by garys_2k:I suspect that the issue is that some information can be conveyed prior to the start of billing. If there's a way to make calls via the PSTN that don't ever start the billing process then that could be expanded to connecting the actual call without the CLEC even being aware that a connection was started.
Maybe I'm wrong (the above is a guess) but I can see how a RBOC or CLEC would be pretty touchy about how call progress data could be used to spoof PSTN calls.
From what I understand...only DTMF can pass through in response to Early Media...not actual audio...so there is no risk of the CLEC being phased out that way...
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