How to interpret SDP payloads of SIP responses?
<p>I conceptually understand the SDP message when it's delivered in the body of a SIP request.  However, given that SIP responses can contain their own SDP message, I find myself wondering whether or not this means that the given SDP message is what the receiver of the request actually did or not.  </p>

<p>Consider for instance that an INVITE is received with a=inactive and the peer responds with a=inactive.  Does this mean that the peer sending the response actually chose to make the media type inactive.</p>

<p>In general, does the SDP request convey how the sender will configure its media services and the response convey how the receiver will configure its media services?</p>