[Asterisk-Users] IAX or SIP

[Anton Krall]

I get a little confused about IAX and SIP, are those 2 diff. protocols? For
example, I know IAX2 works behind NAT or firewalls right? So that users with
IAX softphones or phones can register into asterisk boxes behind firewall or
them been behind a firewall?

Is this true? Then what is SIP, another protocol and can it go behind
firewalls or do you need to configure or open certain ports?

 
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Anton Krall