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Content for  TS 23.204  Word version:  17.0.0

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6.17  Service-level Interworking: SMS user requesting the IP-SM-GW to tear down the Chat session between a CPM user and an SMS user |R10|p. 47

6.17.1  IP-SM-GW in the originating networkp. 47

Copy of original 3GPP image for 3GPP TS 23.204, Fig. 6.17.1: Chat session teardown request to CPM UE (IP-SM-GW in originating network)
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Step 1.
A message is received from the SMS user via the SMS-GMSC by the IP-SM-GW, in accordance to steps 2 to 4 and steps 10 to 13 of clause 6.14, with the operator defined Short Message indicating the SMS user wants to leave the chat session.
Step 2.
The IP-SM-GW performs service-level interworking by recognizing that the Short Message corresponds to the operator defined teardown text indicating the SMS user wants to leave the chat session, so the IP-SM-GW sends a chat session teardown request.
Step 3.
The session teardown request is forwarded by S-CSCF to the CPM UE.
Step 4.
The CPM UE acknowledges the session teardown request.
Step 5.
The acknowledgement is forwarded by the S-CSCF to the IP-SM-GW.
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6.17.2  IP-SM-GW in the terminating networkp. 47

The SMS user in this flow is a CPM user who has set his preferences in his home network to receive his incoming chat sessions as Short Messages.
Copy of original 3GPP image for 3GPP TS 23.204, Fig. 6.17.2: Chat session teardown request to CPM UE (IP-SM-GW in terminating network)
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Step 1.
A message is received from the SMS user via the SMS-GMSC by the IP-SM-GW, in accordance to steps 2 to 4 and steps 10 to 13 of clause 6.14, with the operator provided teardown text indicating the SMS user wants to leave the chat session.
Step 2.
The IP-SM-GW performs service-level interworking by recognizing that the Short Message corresponds to the operator provided teardown text indicating the SMS user wants to leave the chat session, so the IP-SM-GW sends a chat session teardown request.
Step 3.
The session teardown request is forwarded by the S-CSCF towards the CPM user's originating network.
Step 4.
The CPM user's originating network acknowledges the session teardown request and tears down the associated resources.
Step 5.
The acknowledgement is forwarded by the S-CSCF to the IP-SM-GW.
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6.18  Service-level interworking: Status Report procedure for chat session message to Short Message interworking |R10|p. 49

Copy of original 3GPP image for 3GPP TS 23.204, Fig. 6.18: Status report procedure for chat session message to Short Message interworking
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Step 1.
A chat session message from the UE is successfully delivered to the SMS user after service-level interworking according to clause 6.15. The chat session message requested a success or failure delivery report.
Step 2.
The SMS-SC sends a Status report to the SMS-GMSC.
Step 3a.
The SMS GMSC interrogates the HLR/HSS to retrieve routeing information. Based on the pre-configured IP-SM-GW address for the user, the HLR/HSS forwards the request to the corresponding IP-SM-GW.
Step 3b.
The HLR/HSS returns the IMSI and the address(es) of the current MSC, SGSN, MME and/or SMSF to the IP-SM-GW for delivery of the Short Message in CS/PS domain.
Step 3c.
The IP-SM-GW creates a MT Correlation ID as per TS 23.040, which associates the Routing Info retrieval with the subsequent Forward Short Message messages(s), and stores this along with the IMSI of the receiving subscriber. The IP-SM-GW returns to the SMS-GMSC the address of itself, along with the MT Correlation ID in the IMSI field, as routeing information. Alternatively, the IP-SM-GW may return the address(es) of the current MSC, SGSN, MME and/or SMSF, in which case, the subsequent procedure to forward the message is the same as defined in TS 23.040.
Step 4.
The SMS-GMSC sends the status report in the Forward Short Message to the IP-SM-GW.
Step 5.
The IP-SM-GW translates and maps the Status report in the Forward Short Message into a report request as described in MSRP RFC 4975.
Step 6.
The IP-SM-GW sends a Delivery report (SMS-DELIVER-REPORT) to the SMS-GMSC.
Step 7.
The SMS-GMSC sends an acknowledgement back to the SMS-SC.
Step 8-9.
The IP-SM-GW sends a success of failure report based on the value in the status report.
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