Andrew Kohlsmith wrote:
Faxes are designed to work around the noise and other signal problems inherent in analog telephony. VOIP introduces an entirely different set of noise factors that fax machines are frankly ill-equipped to deal with. Jitter and dropped packets are the biggest of these issues.
Jitter and dropped packets usually translate into either periods of silence (and I believe that this is more common) or periods of synthesized audio. The latter will mean in corrupted data and the former will often result in a premature carrier drop detection.
If a receiver prematurely detects a carrier drop in Phase C fax image data then it *must* wait around up to perhaps 60 seconds for the sender signals to return. Many fax machines (and more particularly fax programs) are not this tolerant.
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