VoIP or IP-telephony is a separate type of voice communication that takes place over the Internet. Both real and virtual numbers can be used to make calls. A special device (SIP gateway) is purchased in the first case, where real SIM cards are inserted. Such equipment may contain several SIM cards, but most often eight. You will also need to rent a virtual PBX, the program through which the calls will be made.
The second type of VoIP telephony is the use of virtual numbers. In this case, the company rents virtual telephone numbers in the U.S. for a while and then enters them into a special program (PBX). Just through this application and make all the calls. In the settings of PBX, you can choose the time of incoming calls, set up an answering machine, and activate the recording of conversations. In general, VoIP is the ability to make calls over the Internet using real numbers.
