We have all of our clients configured to do nightly 3CX backups and FTP them to one of our Windows servers. 3CX v11 through 3CX v15 (no service pack) works fine. Once we upgraded 3CX v15 to SP1, FTP backups stopped working. I've tried multiple FTP servers but they all want to do EPSV (Extended Passive FTP) and you can't disable it. Worked with support and they confirmed that EPSV is not there anymore and might be added in a future version. The only backups we can do now is to backup to the local C drive and then run a batch file as a scheduled task to do the FTP transfer. It works, but we don't get an alert if the FTP part failed and it's not as clean. Looking for some up-votes for this to be more of a priority and fixed in a future service pack. Thanks!