EPC+/5GC Feature: SMS solution
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EPC+/5GC Feature: SMS solution

EPC+/5GC Feature: SMS solution
With SMS-over-IP functionality, the UE can send traditional short text messages over the IMS network. In the IMS network, an IP-Short-Message-Gateway (IP-SM-GW) provides the protocol interworking to submit short messages from the sending UE to the service center, and from the serving center to the receiving UE. It also handles SMS status reports from the serving center to the sender.

The following picture shows the interworking of IP-Short-Message-Gateway networking (IP-SM-GW)

The interworking of IP-Short-Message-Gateway networking
Following picture shows the message flow for mobile originating SMS
The message flow for mobile originating SMS 
The UE as SM-over-IP sender submits a short message via a SIP MESSAGE request. This request includes the short message, and routing information for the IP-SM-GW to forward the short message. The S-CSCF analyses the request against the initial filter criteria (iFC) and determines whether to send the SIP MESSAGE request to the IP-SM-GW. The initial filter criteria are made available from HSS to S-CSCF during user registration and indicate the user’s subscription information, i.e. information about the application server to be contacted and trigger points that should be checked before the application server is contacted. The IP-SM-GW forwards the short message to the service center which returns a submission report. The submission report is sent to the UE in a SIP MESSAGE.

Following picture shows the message flow for mobile terminating SMS.

The message flow for mobile terminating SMS
The IP-SM-GW receives a short message from the service center including routing information for the S-CSCF. The short message is delivered to the UE via SIP MESSAGE requests. The UE then responds with 200 (OK) and issues a delivery report in a SIP MESSAGE request. The S-CSCF analyses the incoming request against the initial filter criteria and determines whether to send the SIP MESSAGE request to the IP-SM-GW. The IP-SM-GW accepts and forwards the delivery report to the service center.
IPLOOK provides the IP-SM-GW within our IMS. IPLOOK also provides SMSC and USSD Gateway, please contact IPLOOK for details.
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