in IS-41 first and GSM later, the HPLMN can reject the call
but direct the calling switch directly to the VPLMN, so that
the HPLMN can stay away from the voice trunks. if a guy in
the visited area (not tech term) calls the roaming subscriber:
calling -> called HPLMN
calling <- called HPLMN (reject, provides forward number) *
calling => called VPLMN => roaming mobile
- signal
= voice trunk
* REDREQ (IS-41 redirect request) or
resume_call_handling (GSM)
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Received on Wed Jun 19 16:01:47 2002