SIP trunk
A SIP trunk is a virtual phone line that carries calls over the internet using the Session Initiation Protocol, connecting a phone system or voice platform to the public phone network.
Instead of physical lines from the phone company, a SIP trunk provider gives you capacity for a number of simultaneous calls over an IP connection, plus phone numbers (DIDs) that ring through it. Businesses use SIP trunks to connect PBXs and contact-centre platforms; voice AI platforms use them to make and receive calls on real numbers.
