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Content for  TS 23.204  Word version:  17.0.0

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6.16  Service-level Interworking: CPM capable UE tearing down a Chat session between a CPM user and an SMS user |R10|p. 45

6.16.1  IP-SM-GW in the originating networkp. 45

Copy of original 3GPP image for 3GPP TS 23.204, Fig. 6.16.1: Chat session teardown request to SMS (IP-SM-GW in originating network)
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Step 1.
The CPM UE sends a SIP BYE for an ongoing session to the S-CSCF.
Step 2.
S-CSCF forwards the session teardown request to the IP-SM-GW. The IP-SM-GW performs service-level interworking by converting the session teardown request to a Short Message (SMS-SUBMIT) carrying the SC Address and including operator provided teardown text. The IP-SM-GW uses the SC Address in the subscriber data retrieved from the HSS at registration or provisioned by configuration.
Step 3.
The IP-SM-GW forwards the Short Message towards the SMS-SC (SC Address) via the SMS-IWMSC (as described in TS 23.040). The text in the Short Message is defined by the operator and should convey information to the SMS user that the chat session is ending.
Step 4.
The SMS-IWMSC forwards the Short Message (SMS- SUBMIT) to the SMS-SC (see TS 23.040).
Step 5.
The IP-SM-GW acknowledges the session teardown request and tears down the associated resources.
Step 6.
The session teardown acknowledgement is forwarded by the S-CSCF to the CPM UE.
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6.16.2  IP-SM-GW in the terminating networkp. 45

The SMS user (SMS user B) in this flow is a CPM user (CPM user B) 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. 6.16.2: Chat session teardown request to SMS (IP-SM-GW in terminating network)
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Step 1.
The CPM user's originating network sends a session teardown request for an ongoing chat session to the terminating S-CSCF.
Step 2.
The terminating S-CSCF forwards the session teardown request to the IP-SM-GW serving the SMS user. The IP-SM-GW performs service-level interworking by converting the session teardown request to a Short Message including operator provided teardown text.
Step 3.
The IP-SM-GW obtains the routeing information for the destination UE from the HLR/HSS.
Step 4.
The IP-SM-GW sends the Forward Short Message to the target MSC/SGSN/MME/SMSF. The IP-SM-GW inserts the MSISDN it had previously assigned to represent this chat session as the sender of the message.
Step 5.
The MSC/SGSN/MME/SMSF sends the Short Message to the SMS user.
Step 6.
The IP-SM-GW acknowledges the session teardown request and tears down the associated resources.
Step 7.
The session teardown acknowledgement is forwarded by S-CSCF towards the CPM user's originating network.
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