Little Bit more wide:
-AT Request to AN(UATI request)
-AN sends UATI Assignment to AT.
-Session establised after UATI assignment.
-Authetication for access to AN AAA server.
– Establish link btwn AN & PCF.
-Establish link btwnPCF to PDSN.
– Establish PPP connection btwn PDSN to AT & start TX Data.
Pls. correct if i am wrong.