Just to answer some of your questions.
For CAMEL the DP (e.g. DP2) is done via the gsmSSF.
The configuration of the DP or other Trigger Detection Points is
done via MML – Man Machine Language commands.
CAMEL Subscription Identity Flags (O-/T-CSI) are configured
in the HLR. x-CSI flags enables the MSC/VLR/gsmSSF to trigger the
SCP (gsmSCF).