Snom 4S - Manual (Page 23)

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3 Installation
If you want to install the product on your own, this chapter will
provide you with the necessary information.
3.1 Windows
The Windows version of the NAT Filter comes with an InstallShield
application that should make the installation very simple for you.
Before you start the installation, you might want to make sure
that the necessary ports are available on your machine. Please use the
3.