The overall questions is... What is required to make a SIP to SIP phone call
over an Internet connection?
For example: [email protected] wants to call [email protected]. We both are
registered domains so there isn't really an issue resolving the domain down
to  an IP.

I realize it will have to traverse the NAT but beyond that what are the
steps?
What configurations or hardware is required to place this call?
What gets typed into the phone? If I type in the phone
[email protected] SipX interpret that as
[email protected]@myDomain.com?
(Appending the domain onto whatever the phone wants to dial.)
How does this fit into a dial plan?

Trying to find information on this is rather difficult since the web is
flooded with sites wanted to sell you a ITSP which as best I can figure is a
replacement for a local PSTN, but still doesn't provide SIP-to-SIP calls.


Help would be appreciated.

Christopher Coleman
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