Depending upon your service, you might be limited only to other subscribers to the service, or you may be able to call anyone who has a telephone number – including local, long distance, mobile, and international numbers. If you are calling someone who has a regular analog phone, that person does not need any special equipment to talk to you. Some VoIP services may allow you to speak with more than one person at a time.
Aspects of these considerations may change with new developments in internet technology. You should always check with the VoIP service provider you choose to confirm any advantages and limitations to their service.
From www.fcc.gov/voip
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