hi,
It can be as good or better than standard voice quality. But quality is in the ear of the beholder, so the answer depends on how discriminating your company's end users are. Some companies don't worry much about the quality of VoIP for certain internal calls. But if the calls are involved directly with revenue generation, companies typically have a higher standard.
If you want to measure the quality of a VoIP call, there are methods, including the MedianOpinion Score (MOS) test, endorsed by the International Telecommunications Union (ITU).
Thanks
