I was going to say, make sure your ACLs are set for "Never Block IPs" set to NO for "All Networks", this way your BLOCK IP rules will fire properly and prevent unauthorized hacking attempts. Strong passwords are a must, for both Phone Passwords (if they were set manually) and voicemail. Also, I'd probably lock down the Admin GUI from All Networks. Whereever possible, I would suggest you either set up soft phones with VPN tunnel or use static IPs at employee's homes / etc., to restrict as best as possible how many open IPs you're allowing through your firewall and ultimately to the switchvox.
It's nice to plop the Switchvox open to the internet , to allow anyone from anywhere to connect (without having to use a vpn) but in this day and age and device that's essentially out on the open internet is ripe for the picking/hacking.
We use physical VPN devices for our remote users, that only require web access on their end to tunnel back to us. From there, they can plug in their laptops, physical phones / etc. IT makes securing access to our internet systems a breeze and very easy for our employees to 'set up'. . . just plug it in to an internet connection and away they go.