Section: 9 Message Screening
Content: Screening functions reside within the Packet Domain as described in 3GPP TS 22.060[ General Packet Radio Service (GPRS); Service description; Stage 1 ]  [2], 3GPP TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [3], 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [77] and 3GPP TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [78]. Screening may be applicable for only certain protocols. Screening is outside the scope of the present document.