3GPP Sy  Application ( 16777302 )

The Sy reference point is located between the Policy and Charging Rules Function (PCRF) and the Online Charging System (OCS). The Sy reference point enables transfer of policy counter status information relating to subscriber spending from the OCS to the PCRF.
Reference:  3GPP TS29.219   View
MESSAGES

Name

Code

Session-Termination-Request Sy 275
Session-Termination-Answer Sy 275
Spending-Limit-Request 8388635
Spending-Limit-Answer 8388635
Spending-Status-Notification-Request 8388636
Spending-Status-Notification-Answer 8388636