Through which two procedures does a direct tunnel session change to a two-tunnel session? (Choose two.)
Which failure code is sent in the authentication reject message when a UE with USIM fails to receive the AUTN as part of the authentication and ciphering request from the SGSN?
For inbound Inter-System RAU, which message sends the SGW change indication to the old SGSN?
How does an S4-SGSN identify a peer node as an SGSN or MME when GUTI-to-RAI mapping is unavailable?
Which action does an S4-SGSN take when it receives a secondary PDP context request from the UE?
Which organization developed and maintains the Universal Mobile Telecommunications System?
