Which signaling protocol is predominantly used in the Webex Calling architecture?

The predominant signaling protocol used in the Webex Calling architecture is SIP, which stands for Session Initiation Protocol. SIP is widely adopted for initiating, maintaining, and terminating real-time sessions that involve video, voice, messaging, and other communications. Its popularity stems from its ability to handle multimedia sessions in a flexible and scalable manner, making it well-suited for cloud-based solutions like Webex Calling.

Additionally, SIP supports a range of features critical for modern communications, such as user mobility, call forwarding, group calls, and other enhancements. Its compatibility with various devices and systems further strengthens its role as a core element of Webex Calling, enabling seamless integration with other services and technologies.

In contrast, H.323 is an older protocol primarily used in traditional video conferencing systems, MGCP (Media Gateway Control Protocol) is designed for controlling media gateways in VoIP networks, and SCCP (Skinny Client Control Protocol) is proprietary to Cisco devices. While these protocols have their purposes in telecommunications, they do not provide the same level of interoperability and feature set that SIP does within the context of Webex Calling.