Recommendation ITU-T X.1245 provides the general framework for countering spam in IP-based multimedia applications such as IP telephony, instant messaging, multimedia conference, etc. The framework consists of four anti-spam functions, i.e., core anti-spam functions (CASF), recipient-side anti-spam functions (RASF), sender-side anti-spam functions (SASF), and spam recipient functions (SRF). This Recommendation describes the functionalities and the interfaces of each function for countering IP multimedia spam.