Hi
First thing to check is whether you can connect locally, i.e. from a second PC on your home network, using the local address, often something like 192.168.1.x.
If that works, then the PC running Broadwave is configured OK. If not, then check your firewall as a first step.
If the local PC works, then get someone try try from outside your network using your public IP address - make sure you use the correct one, not your local address. You might not be able to use your public address from within your own network. To find your current public address, do a google search for "my ip".
If that doesn't work, it's your router's port forwarding / firewall settings that need to be looked at.
Also, a useful bit of advice, don't use the default port of 88, choose another one as 88 is often used by other services. I suggest 8811 or something in that range.
When you've tried these steps, please post back exactly what your tried and what you get at each stage, in detail, so we can help.