ntity and the mobile. 5) The message SMS/SMS-SUBMIT/RP-DATA is carried by the message MAP FORWARD SHORT MESSAGE between the MSC server and SMS-IWMSC entities. 6) The message SMS/ SMS-SUBMIT is transferred to the SMS-SC entity. 7) The SMS SC entity acknowledges receiving the message SMS/SMS- SUBMIT message by sending SMS-SUBMIT-REPORT message to the SMS-IWMSC entity. 8) The message SMS-SUBMIT-REPORT/RP-ACK is carried by the message MAP FORWARD SHORT MESSAGE ACK between the SMS- IWMSC and MSC server entities. 9) The message SMS-SUBMIT-REPORT/RP-ACK/CP-DATA is carried by the message SGsAP DOWNLINK UNITDATA between the MSC server and MME entities. 10) The message SMS-SUBMIT-REPORT/RP-ACK/CP-DATA is carried by the message NAS DOWNLINK NAS TRANSPORT between the MME entity and the mobile. Short Message Service The CP-ACK message is transmitted by the mobile to acknowledge the receipt of the message SMS-SUBMIT-REPORT/RP-ACK/CP-DATA. 11) The CP-ACK message is conveyed by the message NAS UPLINK NAS TRANSPORT between the mobile and the MME entity. 12) The CP-ACK message is conveyed by the message SGsAP UPLINK UNITDATA between the MME and MSC server entities. When the SMS-SC entity has the confirmation that the SMS message was delivered to the destination, it sends to the mobile the SMS-STATUS- REPORT/RP-ACK, whose transport is nothing but reproduced steps 7 to 12. 13) The MSC server entity informs the MME entity that the transfer of the SMS message is done by sending the message SGsAP RELEASE REQUEST. 10.2.2.2. Terminating side The transfer procedure for incoming SMS messages is given in Figure 10.5. 1) The SMS-SC entity sends the message SMS/SMS-DELIVER to the SMS-GMSC entity. 2) The SMS-GMSC entity interrogates the home location register (HLR) via the message MAP SEND ROUTING INFO FOR SM to obtain the identity of the MSC server entity. 3) The HLR entity provides the identity of the MSC server entity to the SMS-GMSC entity in the message MAP SEND ROUTING INFO FOR SM 4) The message SMS/SMS-DELIVER/RP-DATA is transported by 