Section: 8 Subscription checking
Content: The subscription of an MS/UE is checked by the PLMN during IP-CAN session establishment procedure as described in 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]. The GGSN/P-GW implicitly checks its internal context related to the destination address for each mobile terminated packet. For PDN types other than Non-IP, if there is a context IP-CAN session associated with the IP address the packet shall be forwarded towards the MS/UE; otherwise the packet shall be discarded or rejected depending on the implemented protocol. For PDN type "Non-IP", the packet shall be forwarded towards the MS/UE, discarded or rejected depending on the implemented protocol.