I am researching about implementing an SMS gateway that supports sending Application to Person (A2P) SMSs (in both MO and MT directions) over a 5G network. It is something similar to an ESME (External Short Messaging Entity), which talks directly to the SMSC on 2G/3G networks.
As illustrated in the above diagram it should be able to forward SMS AOMT received from the third-party application to the 5G Network as well as to forward SMS MOAT received from the 5G network to the third-party application.
To implement the above functionality for SMS over NAS (SMSoNAS) I want to understand,
- Where this SMS gateway fits in the 5G Network architecture? (i.e. Should I implement an SMSF / a component similar to AMF which provides only uplink functions / an MSGin5G server / MSGF ?)
Should I consider the SMS gateway to be an NF consuming the SMSF?
Or should I consider the SMS gateway to be an MSGF?
- Which components should the SMS gateway talk to? (i.e. SMSF / UDM / SMSC)
- Which protocols should the SMS gateway implement? (i.e. SS7-MAP / Diameter / Rest-Based N20/Nsmsf)
I have refered several 3GPP and ETSI 5G specifications including ETSI_TS_129.540, 3GPP_TS_23.502, 3GPP_TS_22.262 and yet was not able to find any answer to above points.
So can you please help me to understand the correct architecture for my SMS gateway
