Ardjan Zwartjes wrote:
One thing that's important to mention here: We get unpredictable results if the fax is transmitted entirely over VOIP, if the fax passes a regular telephony channel once it works fine but if it's purely VOIP, transmission errors occur. This is probably a timing problem, but we haven't been able to solve it yet
It's not a timing problem, it's a "that just happens when you do faxing over typical VoIP channels" problem. The reason it happens is because of jitter... and more specifically, packet loss. On UDP communications packets are not retransmitted if they get dropped by a router or switch or hub. You can't just take a data stream and chop out small chunks of it here and there and expect the receiving end to be okay with it.
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