I have tried running some very large downloads - GigaBytes and at the same time using the VOIP connection. I notice no change in the quality for maybe 99.99% of te time and no additional lag/delay. Yes a packet may get lost/delayed which could result in a small error but very small.#
looking at the various stats for Jitter, Loss, One-way delay, Round trip time shows nothing significantly different from a call with no traffic running. So, even if you are managed/capped in any way, I would doubt that there would be any perceptible problems.
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