A SIP trunk, often known as an IP trunk or SIP trunking, is a digital connection between a personal department change (PBX) and a public switched phone community (PSTN) or different VoIP supplier. It makes use of the Session Initiation Protocol (SIP) to ascertain and handle voice calls over an IP community.
SIP trunks provide a number of advantages over conventional TDM trunks, together with decrease prices, larger flexibility, and improved name high quality. They’re additionally extra scalable and simpler to handle. Because of this, SIP trunks have gotten more and more common with companies of all sizes.