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- Fri 8th Nov 2013, 07:31
#22
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From my experience, Firewall Traversal is one of the biggest stumbling blocks new users experience when getting started using VoIP. There is no dead giveaway when it happens. Things just don't work as expected.
By nature (for security reasons), firewalls block all but essential "ports" that your PC requires to browse the Internet. So, when you start installing VoIP softphones and VoIP hardware adapters (ATA), they often don't work because your firewall is blocking the "special" dedicated communication ports that the VoIP services need to communicate through.
Most people now days have NAT Routers and these routers also have built-in Firewalls.
So now, if your PC is behind a NAT Router, you may have two firewalls to traverse, if you are using a SoftPhone. First, your VoIP packets have to traverse the hardware NAT Router, then they have to traverse the PC software based firewall, such as Windows Firewall, or your pc security software like Norton, McAfee, etc.
Part 2 can be found here.
By nature (for security reasons), firewalls block all but essential "ports" that your PC requires to browse the Internet. So, when you start installing VoIP softphones and VoIP hardware adapters (ATA), they often don't work because your firewall is blocking the "special" dedicated communication ports that the VoIP services need to communicate through.
Most people now days have NAT Routers and these routers also have built-in Firewalls.
So now, if your PC is behind a NAT Router, you may have two firewalls to traverse, if you are using a SoftPhone. First, your VoIP packets have to traverse the hardware NAT Router, then they have to traverse the PC software based firewall, such as Windows Firewall, or your pc security software like Norton, McAfee, etc.
Part 2 can be found here.
- Appreciate my support? Feel free to buy me a coffee.
- Voipfone are offering you the chance to trial their VoIP service for free for 30 days. Sign me up!
- Sign up for a Dropbox account using my referral link and get an extra 500 MB of bonus space. Sign me up!
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