Which method is NOT supported on the Access side of the Webex Calling PBX network?

To understand why the method that is not supported on the Access side of the Webex Calling PBX network is INFO, it’s essential to know the role of various methods in SIP (Session Initiation Protocol) communications.

The Webex Calling service utilizes SIP methods to manage communication sessions. The ACK and INVITE methods are fundamental to establishing and maintaining a call. INVITE is used to initiate a session, while ACK confirms that the recipient received the final response to an INVITE request. Meanwhile, CANCEL is used to terminate a pending INVITE request before it is answered.

On the other hand, the INFO method is designed for transmitting additional information in a SIP session but doesn't play a fundamental role in establishing or managing a call like the other methods. It is primarily used for conveying any interim information or data transfer without requiring call initialization or control functions. Given that the Access side of the Webex Calling PBX network focuses on core telephony functions, the INFO method is not typically supported in that context, as it does not have a critical role in the basic call control process.

Understanding these functions clarifies the limitations and focuses on what is essential for call setup and management in the Webex ecosystem, making it clear why INFO is not utilized on the