The internet is not uniform in quality of service; different paths are built differently and carry different levels of traffic.
Quality voice wants to see low-variance, low-delay paths.
it's possible that the path from A to V and the path from V to C will do better or worse than the path directly from A to C; this vpanel setting lets you choose between going direct to C and going via V.
If you have consistent voice quality problems on your calls it would be worth changing the setting to see if it makes things better or worse but if it's working for you one way, I'd leave it alone.
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