is 150-500ms. Delay in data networks is not as critical. An additional delay of 200ms on an e-mail or web page will generally not be noticed, but voice callers on the same network would be hampered by such a delay. 4.2 VoIP and FAX Can I FAX with VoIP? This question comes up on a regular basis. The answer is "maybe". Some providers allow it, some don't. See this thread for
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