VOIP is an acronym for Voice Over Internet Protocol, or in more general terms, telephone service over the Internet. If you have a decent quality Internet connection, you can get phone service over your Internet connection instead of from your local phone company.
As a rule, VOIP providers offer lower rates than traditional phone companies. That's why some people use VOIP in addition to their traditional phone service. But sometimes VOIP providers don't offer phone book listings, 911 service, 411 service, and other common phone services. There are two main reasons for using VOIP. They are the increased functionality and the lower cost. Some of the main advantages of VOIP are the low cost per call, mobility of the service, versatility of features, easy conference calling, efficient interaction with the customer, and reliability during emergencies.
EN 
DE 
FR 
ES