Section: 7.4.6 Alert MME Notification
Content: An Alert MME Notification message shall be sent on the S3 interface by the MME to the associated SGSN as part of an SGs Non-EPS alert procedure (see 3GPP TS 29.118[ Mobility Management Entity (MME) - Visitor Location Register (VLR) SGs interface specification ]  [22]) when ISR is activated, except under the conditions specified in 3GPP TS 23.272[ Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2 ]  [21], to request to receive a notification when any activity from the UE is detected. Table 7.4.6-1 specifies the presence requirements and the conditions of the IEs in the message. Table 7.4.6-1: Information Element in Alert MME Notification