* @desc Originating Leg With SDP Negotiation in INVITE/200 OK.
* @desc Originating Leg - With SDP Negotiation in INVITE/200 OK.
* On successful call setup, the P-CSCF should derive from the SDP offer and answer, descriptions of the Service Data Flow.
* These are pushed towards EPC as request for creation of adequate bearers. EPC creates based on the EPC's operator policies the bearers for media.
* When transporting media, the EPC will employ the respective bearer's characteristics. Media transport is possible only after the successful establishment of the session.
}// End of TC TC_IMSEPC_Session_Establishment_Originating_0001
/**
* @desc .
* @desc Originating Leg - Without SDP Negotiation in the initial SIP transaction.
* On successful call setup without SDP negotiation (no SDP-offer/answer in the initial SIP INVITE Request / 200 OK Response / ACK Request), there is no request for establishing media bearers from the P-CSCF towards EPC.
* Media transport is not possible either before or after this empty session setup