Summary

That's a lot of information to swallow in one sitting, so I'll understand if you're still confused. Can you believe this is actually the watered-down high-level explanation? Luckily, the FreeSWITCH developers have already been down this road and have done their best to tailor the defaults so that it just works. So, in this chapter, we've identified the pitfalls of NAT and if even one reader is spared the searing pain caused by a first encounter with an ALG or NAT router then our journey into madness was not in vain.

We've also covered all of the options you have in FreeSWITCH to mitigate NAT-related problems and now you can venture into the wilderness and make phone calls where nobody thought phone calls were possible. Before we move on to VoIP security, I'll leave you with a few more tips so hopefully you will get things working perfectly even when plagued by NAT. The following are the tips you should remember:

• Learn the four pitfalls of NAT and keep your eyes open for them

  It's very...