SIP trunks are a modern way for businesses to connect their phone systems to the internet. They use the Session Initiation Protocol to manage voice calls, allowing companies to make and receive calls over the internet instead of traditional phone lines. This can lead to cost savings and increased flexibility. By using SIP trunks, businesses can easily scale their communication needs, adding or removing lines as required. This technology also supports various features like video calls and messaging, making it a versatile choice for companies looking to enhance their communication capabilities.