This is another source of great confusion. If you are new to FreeSWITCH, forget about the meaning you used to associate to the word "extension". In FreeSWITCH "extension" is an immaterial concept. It can be understood as "a group of instructions into a context". OK, this leave us with the problem of what a context is. A context is a named collection of extensions. So, in a way, we have a circular definition here, in which contexts and extensions define each others.
Bear with me and in a couple of paragraph we'll be over all this.
FreeSWITCH has "profiles". A profile is a collection of configurations that is related to a specific IP address and port couple. For example 192.168.1.12:5060 is a profile, 192.168.1.13:5060 ...
