Universal Mobile Telecommunications System (UMTS); LTE; Study of mechanisms for Protection against Unsolicited Communication for IMS (PUCI) (V9.2.0; 3GPP TR 33.937 version 9.2.0 Release 9)
"The scope of this report is to highlight alternative solutions that could be used to protect mobile subscribers from receiving unsolicited communication over IMS and to analyze these solutions in respect of their requirements and impacts on standardized interfaces. This activity took into account the study done in TISPAN TR 187 009 on ""Feasibility study of prevention of unsolicited communications in the NGN""."