On 09/10/2013 12:15 PM, Joshua Colp wrote:
Sean Darcy wrote:
Maybe a different question would be helpful. Let's assume no NAT; the
server is directly connected with an FQDN. Two iax devices register.
Does asterisk assign them different ports?
Asterisk does not assign ports. The IAX2 channel driver, by default,
binds to a single UDP port (4569). As UDP is connectionless there are no
connections. What you see on the console is the *source* IP address and
port of the packets. It's possible that the Amazon stuff is sort of
NATting things to do connection tracking... but that's Amazon land, so
no clue really.
Since no horse is dead enough not to take another beating:
If the console is showing the *source* port of the packets. then:
does the server send iax packets to that source port, or to 4569?
"home" (which is another asterisk server) shows 4569, while the androids
running zoiper show random ports. I assume zoiper puts the source port
in an iax packet. But regardless of how zoiper describes its source
port, asterisk will only send iax packets on 4569. correct?
I ask all this because Amazon EC2 uses a firewall that doesn't have a
connection state. All incoming ports are blocked unless they are
explicitly opened. Just having a packet go out to an ip address and
port, doesn't open the source port.
But if iax is always and only using 4569 to send and receive, I don't
have to worry about opening any other ports.
Thanks,
sean
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