You’re Q is a bit askew:
VoIP is a custom (method) for promulgation voice, so there is customarily a single ‘type’.
Perhaps we meant ‘application’ use (like Skype, Yahoo!, as well as so on), that could be any series of choices.
Skype is sincerely decent, as well as supports webcam additionally (but so do many others).
As distant as hardware; customarily a combo headset (mic & headphones) functions a best, as well as customarily requires simple receptive to advice card.
Configuration issues would be a customarily alternative intensity issues.
Your firewall (or NAT router) will need to have QoS enabled; installing a focus use customarily automatically determines many of a settings & hardware upon a section onto that it’s installed.

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