SIP trunking is a process that enables phone calls to take place via an internet connection, allowing businesses to reach customers worldwide with affordable and scalable person-to-person communication. It uses an existing PBX to route calls to the outside world through the cloud, enabling flexibility and meeting customers where they are. While VoIP and SIP trunking work together, they are not the same - VoIP is a general practice of using the internet for voice calls, while SIP trunking is a specific technological practice that connects traditional phone lines to cloud-based systems utilizing VoIP technology. The benefits of SIP trunking include lower costs, improved efficiency, analytics and data insights on calls, scalability, and reduced maintenance commitments. Twilio's Elastic SIP Trunking is a top-rated provider for customer satisfaction, offering global VoIP infrastructure deployment in minutes and valuable analytics through Twilio Voice Insights.