LMSD Offerless INVITE handling

To enhance LMSD interworking, the Oracle Communications Session Border Controller does not remove SDP from a 180 response sent back to the UAC when the initial request did not contain SDP. The Oracle Communications Session Border Controller also forwards UAS-side UPDATE requests to the UAC; it does not respond locally. These represent behavioral changes and require no configuration.

When LMSD Interworking is configured on a SIP interface, and when the UAS includes SDP in the 180 Ringing message (and the Alert-Info header is set to rt), the Oracle Communications Session Border Controller no longer strips the SDP when forwarding the 180 back to the UAC.

SBC fowards the UAS's SDP to the UAC in the 180 Ringing message.

When LMSD interworking is configured on a SIP interface, and in the case that an early dialog has been established (a dialog where the final 2xx class response to INVITE request has not yet arrived), some call flows include an UPDATE later in the call. The Oracle Communications Session Border Controller now forwards the Update message, SDP included, directly to the UAC, whereas before it responded to the UAS's UPDATE locally.

The LMSD Offerless INVITE Handling with Early Dialog call flow is described above.