What does a "200 OK" response typically include after an INVITE?

A "200 OK" response is a standard reply in SIP signaling that indicates the successful acceptance of an INVITE request, which is used to initiate a call. After an INVITE is accepted, the "200 OK" response generally includes the Session Description Protocol (SDP) body. This SDP body is crucial as it describes the media parameters for the session that is about to be established, such as the codecs to be used, media formats, network information, and the types of media that will be exchanged during the call.

The inclusion of an SDP body in the "200 OK" response is important for both parties to have a clear understanding of how the media will be transmitted, facilitating the configuration of audio or video streams. Without this information, the communication would not be properly set up, leading to unsuccessful call connections.

The other options do not correctly represent the content or purpose of the "200 OK" response. Information about the caller is not typically included in the response, as it does not deal with identity details in this context. An error message would not be found in a "200 OK" response, as that would indicate a failure to process the request. Lastly, confirmation of call end relates to the termination of a call, which is outside