Section: 17.5.8 Trace Session Activation procedure
Content: The Trace Session Activation procedure occurs when the GGSN indicates to the BM-SC that a Trace Session needs to be activated. Figure 33: Trace Session Activation procedure 1. When the GGSN has received a Trace Activation message from the SGSN, in a Create MBMS Context Request/Update MBMS Context Request, that requires the activation of a Trace Session in the BM-SC, the GGSN sends an AAR message (containing the IMSI and the Additional MBMS Trace Info AVPs) to activate a trace session in the BM-SC. 2. Upon reception of an AAR from a GGSN to activate a Trace Session, the BM-SC responds with an AAA message.