Rich Communication Services (RCS) is the next evolution of SMS. It brings a feature rich user experience incorporating Images, video, audio.
If you deployed an LTE network with VoLTE and WiFi Calling, why not make the same transition for SMS to operate over LTE (without fallback), WiFi or any other IP access. Anam IP-SM-GW is also integrated with full Anti-Fraud, Anti-Spamming and range of other value-add services (e.g. multi-device SMS).