VOIP - Softphone to Softphone
I've been thinking on and off about playing around with VOIP. I'm a college student, and live in an apartment with a few roommates during the semester (or when I'm working by school) and live at home the rest of the time. Being plagued by an aging Treo 600, I was thinking that it would be great to be able to call home on a VOIP phone (and then perhaps expand it to other uses).
I'm on residential connections at both ends (FiOS at home and Optimum cable in the apartment) so I'm not too sure what the quality would be, and I know that QoS doesn't even exist.
I have high-numbered ports open at both ends, and full control over the routers. The machines in the apartment are Linux boxen, but since I's probably be calling home to one of my parents, I's be dealing with Windows on the other end.
So, my question:
Is it possible to, for testing purposes, connect one softphone to another, with nothing in between? i.e. use port forwarding on both routers, and simply initiate a call to an IP address and port? Any suggestions on software to use, and where to look for information?
I've been able to find a lot of information on VOIP, but the bottom line is I don't want to use Skype or any other provider, but I don't want to tie up a box for Asterisk yet. I'd like to give it a test run direct from one soft phone to another, and then (assuming all goes relatively well) move to an Asterisk box at home (and possibly in the apartment) and hard phones.