I’ve got a SNG7/freepbx 15 issue, I restored a backup form a Freepbx 14 install that I was migrating to a new host, and I am now seeing a random = being added to voicemail.conf that stops reloads/viewing the VM admin module etc. under [pbxaliases] I see this as the last line:
you will get a full list of extensions with vm enabled. Look thru the list and see if one of the devices listed has something “odd” in the type column If there is one, that is probably the problem extension. Edit it, and resubmit without changes to see if it resolves.