What is a SIP trunk mainly used for?

A SIP trunk is primarily utilized to facilitate making and receiving voice calls over the internet using the Session Initiation Protocol (SIP). This technology enables businesses to leverage Voice over IP (VoIP) systems, connecting their private branch exchange (PBX) directly to the internet. By using a SIP trunk, companies can bypass traditional telephone lines, significantly reducing costs and increasing scalability compared to conventional telephony services.

The ability to make and receive calls over the internet makes SIP trunks an essential component for modern communication systems, allowing for features such as call forwarding, voicemail, and conferencing, all integrated into the VoIP infrastructure. This streamlines operations and enhances collaboration within organizations, especially as remote and hybrid working environments become more common.