What does "Invite" handling latency refer to in SIP communications?

"Invite" handling latency in SIP (Session Initiation Protocol) communications specifically refers to the delay experienced in processing an incoming INVITE request. This is an important aspect of SIP communications, as it directly affects the time it takes for a call setup to occur. When an INVITE request is sent, the receiving party needs to process this request, which may involve various factors such as user authentication, resource availability, and interaction with other network components.

If this latency is high, it can lead to a noticeable delay for users before they can actually begin communicating. This can impact user experience significantly, especially in environments where low latency is critical, such as in voice over IP (VoIP) services.

The other options do not accurately capture the specific nature of "Invite" handling latency. While delays in sending an INVITE request, connecting a call, or ending a session may contribute to overall delay in a communication session, they do not specifically address the processing time required for an incoming INVITE request, which is what "Invite" handling latency is focused on.