I am trying to understand the relationship between profiles and gateways. Can someone explain the relationship or direct me in a direction where I can find more info? (I have already tried the wiki and googled quite a bit).

When would I want more than on external and one internal profile? Would I ever want less than those two? Do I always want to separate internal and external? When would I add more than one gateway for a profile?

I have a SIP trunk and my provider asked me to forward port 5060-5065. So I did that and then I set external_sip_port to 5060. I receive incoming calls on port 5060. Is there a standard way of registering an other port with my SIP trunk provider?

As I only have one gateway (a SIP trunk) for my external profile I don't really understand the relationship between the profile and gateway. I don't really understand when I would want more than one gateway for that profile.

I also want to use the internal profile for users to register their softphones directly to my freeswitch server. Do I have to do anything special to get this to work? Will there be any problems from letting two profiles listen on the same port (5060)?