which is an application that makes and receives calls directly from a computer or mobile device. When it comes to calling features, VoIP systems offer more configuration options than PBX systems.

PBX systems typically allow companies to contact ... a direct dial number for every user; multi-device ringing; extension dialing to the app; call transferring from the app; call flipping; as ...

which is an application that makes and receives calls directly from a computer or mobile device. When it comes to calling features, VoIP systems offer more configuration options than PBX systems.