[asterisk-users] Asterisk architecture

[Christopher Chan]

> so if you have u1 and u2 and they simply wish to
> communicate and they have eachother's IP, do they need
> Asterisk for something? 

no.

> 
> Also, in a pure SIP implementation, what does Asterisk
> offer and what is Asterisk required for?

line/no. registration and setting up calls between sip phones.

asterisk is required, I believe, when you need an easy method of getting 
your users to be able to call one another other than supplying a list of 
ip addresses and fixing the ip address of each user.