What does the SIP method "BYE" do?

The "BYE" SIP method is specifically designed to terminate an active call or session. When a user or device sends a BYE request, it signals the other party that the communication is concluding, and they should release the resources associated with that call. This can occur for various reasons, such as the end of a conversation or if one party needs to disconnect for any purpose.

In the context of SIP (Session Initiation Protocol), each method has a distinct function. Initiating a call, for instance, is performed by the "INVITE" method, while placing a call on hold typically uses "REFER" or "SIP INFO." Retrieving information about a session often involves methods such as "OPTIONS" or engaging in a dialog, which is not the function of the BYE method. Thus, the correct understanding of BYE’s role is essential for effective call management within SIP.