Has anyone ever successfully connected a MultiTech FaxFinder FF240-IP to a Mitel 3300/MCD/MiVoice Business via SIP trunks? No matter what I try on an outbound fax the call is always rejected with a "503 Service Unavailable" error, no matter if I try T.38 or G7.11 pass thru. Mitel offers no information and neither does MultiTech, at least that I can find. Any help would be appreciated. Thanks!