Related post - "ETB [Colombia] Uses Alepo's PCRF-Lite" - here.
"In order to enable LTE to Wi-Fi offload at ETB, Alepo integrated its carrier-class Wi-Fi Offload platform with ETB’s LTE Home Subscriber Server (HSS). Armed with subscriber profile information, the Alepo solution is able to authenticate ETB subscribers to the Wi-Fi hotspot without requiring them to manually log on to the Wi-Fi hotspot network at each use. The scalable solution employs open, standards-based interfaces, making ready to deploy in best-of-breeds network environments of any size".
See "Alepo Makes Wi-Fi Offload a Reality for ETB in Colombia" - here.