If you are using PSTN lines, feel free to skip this topic as you don't have to worry about any firewalls, NAT, or ports configurations.
Unless you stick your non-firewalled PBX system on the public network with a public IP, you will need to adjust your firewall. The firewall is usually your first line of defense in isolating your computers from the outside world. These can be hardware (Linksys/Cisco, Netgear, D-Link, among others) connected to your Internet modem, or software (Windows Firewall, or some other third-party software) firewalls that you will need to adjust to allow the SIP traffic into your private network.
Most people use Network Address Translation (NAT) in a small office/home environment. This makes it easy to set up, and you don't have to buy a bunch of static IPs' for various server uses (e-mail server, web server, PBC, and so on).
You will need to forward the following ports to your PBX:
Port |
Description |
---|---|
UDP 5060 |
This is the standard SIP port used to send... |