TWhich way TS12 calls originating:
a) inside the private network and remaining inside private network?
b) from inside going outside to public network?
c) outside public network going into private network?
ETS 300905 Third Edition (GSM0203) states
Table 2: Teleservice categories and Teleservices
“NOTE: Direct access to private networks is foreseen by recommended provision A.
3GPP 22.003-800 does not mention private network.