3GPP Wa  Application ( 29234 )

The Wa reference point is between the AAA and Access Network Gateway. RADIUS (Remote Authentication Dial In User Service) over the Wa Interface is used for remote user authentication and accounting in WLAN Interworking/Wi-Fi offloading environments.
Reference:  TS 29.234   View
MESSAGES

Name

Code

Accounting-Request-Start-Wa 4
Accounting-Request-Stop-Wa 4
Accounting-Request-Interim-Update-Wa 4
Accounting-Response-Wa 5