It depends on what you mean by "voip".
You can use voip (vonage, et al.) to hook you up from your place over to the outside world.
Or you can use it inside the building to connect the telephone sitting on your desk to the central PBX phone system at your office, which is then connected to the phone company via more traditional means.
While I personally haven't seen a compelling advantage in situation B (except for one thing, the potential to connect remote sites, buildings, or individual phones into the PBX over the network), if installed in a competent manner, it should be pretty reliable. When I put in a new PBX at work last summer I picked one that we could use VOIP with just by enabling some software licenses so I'd have the flexibility if I ever felt like it, but so far, I haven't.
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