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If you want a round about way of receiving inbound Google Voice calls through SIP (for free) you can do the following:

1. Get free SIP service from IPTel (http://www.iptel.org/service).

2. Get a free phone number in the Washington area with IPKall (http://www.ipkall.com/).

3. Add your new IPKall number to your Google Voice account.

Now when someone rings your GV number it will call your IPKall number which will in turn call your IPTel SIP account.

I tried to use a few numbers from IPKall but they were all already registered with Google Voice. Sipgate[1] gives you a number free and was easy to setup with some instructions[2] from XDA.

[1] http://www.sipgate.com/ [2] http://forum.xda-developers.com/showthread.php?t=887131

Sipgate has been out of numbers since the Gizmo5 shutdown notice went around. They expect to have some soon, but no real info on a timeline.

Is this something like what's going to happen with IPv4?

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