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Question about Pass-Through faxing

I'm learning about all the fax protocols for the Gateway/Gatekeeper exam (this fax stuff is my weak point, so I'm tackling it first), and I'm looking at Cisco pass-through right now.

My question is - why would someone want to use it verses, say, T.38 fax relay? This one is allegedly the standard to use. Pass-through is sensitive to packet loss, delay, and jitter, it has no VAD or echo cancellation, and it requires the G.711, bandwidth-eating codec. It also appears to be proprietary.
"Computers in the future may weigh no more than 1.5 tons." - Popular Mechanics, 1949
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