Just to clear up any confusion, this seems to be the post people are having trouble with.
You want Misc:Port and Billing:Port within server.ini to be different, but you want that Billing:Port to be the same as Misc:Port in subbill.ini.
Solo's post implied that the subbill.ini Misc:Port should be different than server.ini's Billing:Port, when in fact those should be the same value (and as a generally good practice, both should be set to 185).
Hope that helps clarify things for people who were confused, and for other people who couldn't figure out why people were having trouble with that entry...