I think you can use asterisk for your sip implementation.
 
As you already know, SIP is peer to peer and you don't need asterisk when u want to communicate just between two users. If you are thinking about having more than 2 users (say 25) in the setup, Asterisk will help you there. In this case, Asterisk will be the SIP registrar/feature server for all the users. Sip UA (users) will send the requests to asterisk and asterisk will route the call appropriately.

Hope this helps
 
On 11/3/06, Christopher Chan <[EMAIL PROTECTED]> wrote:

> 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.
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Thanks,
Vikki.
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