Quote Originally Posted by chpalmer View Post
When I use an ATA, I see only the one server in my firewall states.

When I try to use an Asterisk product it connects to one at the sip port (say 5060) but when a call is made I connect out to that same server but another tries to connect back this way...

My firewall states show this way...

65.xx.xx.xx:52854 <- 172.31.125.21:49518

172.31.125.21:49518 -> mypublicip:56758 -> 74.52.58.50:52854

I think this is by design..?.
Ah, okay! I get it. Yes, this is by design. I'm about 99% sure what you are seeing is the switch in question connecting back to you. Unlike some providers (viatalk?) who funnel everything through the server (SIP and audio streams), voipo does not. Whichever switch handles your call is what connects to you to process the audio stream...