nating the SMS message. MESSAGE sip:alice@homeA.net SIP/2.0 Short Message Service 10) The message SMS-SUBMIT-REPORT/RP-ACK is carried by the SIP MESSAGE message between the S-CSCF and the P-CSCF entities. 11) The message SMS-SUBMIT-REPORT/RP-ACK is carried by the SIP MESSAGE message between the P-CSCF entity and the mobile. 12) The 200 OK response acknowledges the SIP MESSAGE message received by the mobile. 10.3.2.2. Terminating side The transfer procedure for incoming SMS messages is given in Figure 10.8. 1) to 4) The messages are identical to those exchanged for SMS over SGsAP, the IP-SM-GW entity playing the same role as the MSC server entity. 5) The message SMS/SMS-DELIVER/RP-DATA is carried by the SIP MESSAGE message between the IP-SM-GW and S-CSCF entities. The identity of the request contains the URI identity of the mobile receiving the SMS. The IP-SM-GW entity inserts in the header P -Asserted-Identity - its own identity. MESSAGE sip bob@homeB.: net SIP/2.0 P-Asserted-Identity: <sip:ipsmgw.homeB.net> 6) The message SMS/SMS-DELIVER/RP-DATA is carried by the SIP MESSAGE message between the S-CSCF and P-CSCF entities. 7) The message SMS/SMS-DELIVER/RP-DATA is carried by the SIP MESSAGE message between the P-CSCF entity and the mobile. 8) The 200 OK response acknowledges the SIP MESSAGE message received by the mobile. 9) The message SMS-DELIVER-REPORT/RP-ACK is carried by the SIP MESSAGE message between the mobile and the P-CSCF entity. 286 VoLTE and ViLTE P-CSCF S-CSCF IP-SM-GW SMS / SMS-DELIVER SEND ROUTING INFO FOR SM SEND ROUTING INFO FOR SM ACK SMS / SMS-DELIVER / RP-DATA MAP FORWARD SHORT MESSAGE SMS / SMS-DELIVER /RP-DATA SIP MESSAGE SMS / SMS-DELIVER / RP-DATA SIP MESSAGE SMS / SMS-DELIVER / RP-DATA SIP MESSAGE 200 OK 200 OK 200 OK SMS-DELIVER-REPORT / RP-ACK SIP MESSAGE SMS-DELIVER-REPORT / RP-ACK SIP MESSAGE SMS-DELIVER-REPORT / RP-ACK SIP MESSAGE SMS-DELIVER-REPORT/RP-ACK MAP FORWARD SHORT MESSAGE ACK SMS-DELIVER-REPORT Figure 10.8. Procedure at terminating side for SMS over SIP The identity of the