If you're trying to send multiple DIDs to fax server and decode to multiple email addresses you'll need a little magic. Add the license for "Analog Voice Mail", and create a HG for inbound faxing. Flag the HG as VOICE MAIL. Then create a phantom ext for each DID, with ext number = destination fax mail box. Use SYS FWD to send all these phantom ext to the fax HG. When fax server answers the 5000 will send DTMF matching phantom ext, so fax server knows who message is for.