What does "SIP Trunking" refer to in the context of Webex Calling?

SIP Trunking refers to the process of establishing voice communication over the internet using the Session Initiation Protocol (SIP). This technology allows for voice calls to be transmitted over an IP network instead of traditional, circuit-switched telephone networks. By using SIP trunking, organizations can facilitate voice communication efficiently, reducing costs and simplifying their telephony infrastructure. This method supports various features like scalability and flexibility, allowing businesses to adapt to changing communication needs without the constraints of conventional phone lines.

In the context of Webex Calling, SIP trunking enables seamless integration of voice services, allowing users to make and receive calls via the internet while leveraging existing VoIP technologies. This is fundamental for modern telephony, especially in the context of cloud-based systems like Webex.