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(Sorry if this question is a little basic or should go on a different SE site. Just let me know.)

I'm trying to learn about SIP. The problem is that I'm at the point where I don't know enough to try it myself to learn and sometimes I don't know enough to know what question to ask. I have seen that you can get a SIP account/username from websites like that will give you something like that you can sign into with a client software like Ekiga (the software).

So, what things would I have to set up/do to make it so a can take a domain I have (like and set up an account like have the SIP calls come in to Ekiga?

I'm not looking for step by step instructions so much, but instead to understand what pieces I need to set up/have in place for this to work.

I currently have an 12.04 server with a public IP (and IPv6 also), so I'm hoping that may sidestep issues I might have with NAT (I've heard that part can be tricky, and would be fine using only IPv6 if that makes it easier).

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  1. A SIP server to deal with the incoming calls (and indeed Asterisk is a good open-source choice, and available as ubuntu package).
  2. DNS records publishing the right service to use for SIP service. For example to correctly process the SIP url I added SRV records to DNS: has SRV record 0 0 5060

Not all SIP clients use SRV records (by default).

And most SIP clients do not support IPv6 yet.

(what happens with is explained at metar in asterisk.

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You simply need a SIP server like Astarisk (though astarisk is a bit more). You set it up and create users. That's what you need.

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