New SDP Parameters in INVITE with Replaces

When an INVITE with Replaces: header is received, the media parameters in the new SDP are compared against the SDP of the dialog to be replaced. If any portion of the SDPs (excluding the session-origin line) is different, then the media must be renegotiated. The Oracle Communications Session Border Controller sends a re-INVITE with the new SDP to the dialog opposite of the one being replaced as shown below. If the re-INVITE fails for any reason, then the original dialogs will remain.