SIP trunking is a telecommunications technology that connects private branch exchange (PBX) systems to the public switched telephone network (PSTN) via the internet using Session Initiation Protocol (SIP). This technology enables businesses to make and receive phone calls over the internet, eliminating the need for traditional phone lines and physical infrastructure. 
SIP trunking supports multiple voice channels over a single internet connection, providing scalability and flexibility for organisations with variable communication needs. It typically reduces call costs and maintenance expenses while allowing seamless integration with existing communication systems. Additionally, SIP trunking enhances reliability and offers advanced features such as call forwarding, voicemail and conferencing, making it a valuable tool for modernising telecommunications and improving overall business operation
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