A SIP trunk provider, also known as a SIP trunking service provider, is a company that provides businesses with connectivity to the public switched telephone network (PSTN) using Session Initiation Protocol (SIP) trunks. SIP trunks are virtual circuits that allow businesses to make and receive phone calls over the internet, eliminating the need for traditional phone lines.
SIP trunking offers a number of benefits for businesses, including cost savings, scalability, and flexibility. SIP trunks are typically more affordable than traditional phone lines, and they can be easily scaled up or down to meet the changing needs of a business. SIP trunks also offer a number of features that are not available with traditional phone lines, such as call forwarding, voicemail, and auto attendant.