[Serusers] How does $f.did work?

In ser-oob.cfg, the route[AUTHENTICATION] function has this code: # Requests from non-local to local domains should be permitted. # Remove this if you want a walled garden. if (!$f.did) { break; } I'm guessing that the code is permitting all invites that are addressed to a local destination, regardless of the source of the invite, so that the source is not required to authenticate itself. Is that right? Also, what is the tersely named $f variable, how does it get initialized, and what is the meaning of the .did member? Many thanks! -- Mark Sidell Partner Forte, Inc. 919-942-7068 fax 919-969-2844 www.forteinc.com