rts from the mobile in the message RRC MeasurementReport. 2) The eNB entity sends to the MME entity the message S1-AP HANDOVER REQUIRED. The handover request may also relate to the flow transferred to the 3G UMTS network in PS mode. 3) From the quality class index (QCI), the MME entity separates the audio stream (QCI = 1) and possibly video (QCI = 2) from other flows and initializes them to be relocated either to the MSC server entity (RTP stream) or to the SGSN entity. VoLTE and ViLTE The MME entity initiates the procedure of PS-CS inter-system handover by transmitting the message GTPv2-C SRVCC PS-CS REQUEST to the MSC server entity, which contains the STN-SR session number and the MSISDN phone number. The MSC server entity sends a handover request to the UMTS terrestrial radio access network (UTRAN) of the UMTS network or the base station sub-system (BSS) of the GSM network. After reserving the resources, the access network acknowledges the request received from the MSC server entity. The answer carries a container that will be transmitted to the mobile. This container contains the radio characteristics of the 2G or 3G cell, which will optimize the mobile connection time. 4) The MSC server entity responds to the MME entity by indicating that resources are available for the execution of the handover in the message GTPv2-C SRVCC PS-CS RESPONSE. 5) The MME entity triggers the execution of the handover by sending the message S1-AP HANDOVER COMMAND to the eNB entity. 6) The eNB entity transmits to the mobile the message RRC ConnectionReconfiguration, causing the connection establishment of the mobile to the radio station of the BSS or UTRAN access network. 7) When the mobile is connected, the access network notifies the MSC server entity which informs the MME entity to the completion of handover in a message GTPv2 SRVCC C-PS-CS COMPLETE NOTIFICATION. 8) This message is acknowledged by a message GTPv2-C SRVCC PS-CS COMPLETE NOTIFICATION ACK. The MSC server entity assigns a temporary mobile subscriber identity (T-TMSI