SIP trunking is conquering the business world. However, some still do not know exactly what SIP services are, how they work or what to expect from them. We want to explain some essential aspects of this service, so in this article we will examine what SIP trunking is, what its benefits are and introduce you to the most popular SIP trunking providers on the market.  What is SIP Trunking definition? SIP or Session Initiation Protocol is a way to carry through voice over IP (VoIP) calls. It is an application layer protocol for real-time audio and/or video sessions between two endpoints. To put it simply, SIP is a technology that originates, maintains, modifies, and terminates call sessions over an IP network.   Basically, SIP trunks are the virtual version of analog telephone lines. When using SIP trunks, a SIP provider connects one or multiple channels to a Private Branch Exchange…