Paging to the terminal will be triggered to the serving node when retrieving Location Information from the HSS on INVITE i.e. when the CM mtasMmtNpliTerminating is set to FIXED_ORDER.
Paging to the terminal will be triggered to the serving node when retrieving Location Information from the HSS on INVITE (when the CM mtasMmtNpliTerminating is set to FIXED_ORDER) or and on incoming 180/200 response on (re-)INVITE.