* @desc Verify that the E-CSCF successfully processes an initial INVITE (Originating Leg)..
* @desc "Verify that the E-CSCF successfully processes an initial INVITE from the P-CSCF and routes the request to the PSAP in the IM CN subsystem of own network."
* Reference
* "ETSI TS 124 229 [1], Clauses 5.11.2"
* Config Id CF_VxLTE_INT
* PICS Selection NONE
* Initial conditions with {
* the UE_A entity isAttachedTo the EPC_A and
* the PSAP entity isAttachedTo the EPC_B and
* the UE_A entity isRegisteredTo the IMS_A and
* the PSAP entity isRegisteredTo the IMS_B
* the IMS_E_CSCF entity supportsRoutingTo the IM_CN
* }
*
* Expected behaviour
* ensure that {
* when {
* the IMS_E_CSCF_A entity receives an INVITE containing
* the IMS_E_CSCF entity receives an INVITE containing
* From indicating value PX_UE_A_SIP_URI,
* To indicating value PX_PSAP_SIP_URI,
* To indicating value PX_SIP_EMERGENCY_SERVICE_URN,
* CallId indicating value PX_UE_A_CALLID,
* Via indicating value PX_UE_A_VIA,
* Route indicating value PX_UE_A_SERVICE_ROUTE,
* PAccessNetworkInfo,
* MessageBody containing
* SDP containing
* Version indicating value "0"
* Via indicating value PX_P_CSCF_A_VIA,
* Route indicating value PX_E_CSCF_SERVICE_ROUTE, // 5.2.10.3 1B) option is assumed
* PAssertedIdentity,
* MessageBody;
* from the IMS_P_CSCF_A entity
* }
* then {
* the IMS_IBCF_A entity sends an INVITE containing
* the IMS_E_CSCF entity sends an INVITE containing
* From indicating value PX_UE_A_SIP_URI,
* To indicating value PX_PSAP_SIP_URI,
* To indicating value PX_SIP_EMERGENCY_SERVICE_URN,
* CallId indicating value PX_UE_A_CALLID,
* Via indicating value PX_UE_A_VIA,
* Route indicating value PX_UE_A_SERVICE_ROUTE,
* PAccessNetworkInfo,
* MessageBody containing
* SDP containing
* Version indicating value "0"
* to the PSAP entity
* Via indicating value PX_E_CSCF_VIA,
* Route indicating value PX_PSAP_SERVICE_ROUTE_IM_CN,