I read a post by smachine detailing how to do this a few weeks back and it seemed so simple, I thought I'd try it. And it was! I wish I had done this months and months ago; unlimited calling over wifi and 3G, so easy! His original post is here: http://forum.xda-developers.com/showpost.php?p=8813244&postcount=18
This is so awesome I thought I'd start a new thread on this for others to see, and make a little guide out of it for easy reading / bulleted-format. The entire process should only take around 15 minutes. Here goes:
[Edit 11/23]: Added CSipSimple setup info and link for Sipgate setup
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Hope this helps others out there.

This is so awesome I thought I'd start a new thread on this for others to see, and make a little guide out of it for easy reading / bulleted-format. The entire process should only take around 15 minutes. Here goes:
[Edit 11/23]: Added CSipSimple setup info and link for Sipgate setup
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- Get a SIP Account:
A) Purchase a Gizmo5 account (eBay around $5 to $10). (I purchased from buildfruitkit.)
B) [Edit 11/23]: Or try a free SipGate account (Note: I haven't tested this but might be worth a try before buying a Gizmo5 account.)
- Log into https://my.gizmo5.com -> Change email -> Change password -> Write down your Sip Number
- On PC: www.google.com/voice -> Voice Settings -> Add another phone
- Name: SIP
- Number: Your Sip Number (no "1" beforehand)
- Phone Type: Gizmo
- Save
- Verify the number (click Connect, it will call, Sipdroid will ring, enter the two numbers)
- You now have free incoming calls! Yay!
- On phone: Download CSipSimple OR Sipdroid from the Android Market:
- CSipSimple (Seems to be better than Sipdroid) [Added 11/23]:
- Open app. Wait for files to download
- "Easy Configuration" Screen:
- "Integrate with Android": Leave checked
- Availability Profile: Choose based on preference
- "I'm allowed to use mobile": Check this if you want to call over 3G
- Add Account:
- Select Sipgate or Generic Wizards -> Basic
- Account name: Anything (I put "Gizmo")
- User: Your full sip number (including 1 beforehand)
- Server: proxy01.sipphone.com
- Password: Your Gizmo password
- It should show up in the accounts list as Green and Registered
- Sipdroid:
- Open App -> Settings -> SIP Account
- Authorization Username: Your Sip Number (including a "1" beforehand)
- Password: Your Gizmo password
- Server or Proxy: proxy01.sipphone.com
- Username or Caller ID: Your Sip Number again (including a "1" beforehand)
- Port: 5060
- Settings -> Advanced Options
- Use STUN Server: Check this box
- STUN Server name: stun01.sipphone.com
- STUN Server port: 3478
- (Optional: if you find calls too quiet) Sipdroid -> Settings -> Audio/Video -> Earpiece Gain -> High or Highest
- Open App -> Settings -> SIP Account
- CSipSimple (Seems to be better than Sipdroid) [Added 11/23]:
- For outgoing calls, download "Google Voice Callback FREE" from the Android Market (no need to purchase Gizmo5 credit)
A) Sign in with your Google username/password.
B) Choose your callback number (select Gizmo), and select "Ask every time" or "Always (when possible)" based on your preference.
- Calling:
A) Incoming calls: These should be routed through CSipSimple/Sipdroid (as long as the app is running).
B) Outgoing calls: Use the stock dialer. GV Callback Free should pop up -> Tell it to call you back. This will make it act as an incoming call just like A)
Hope this helps others out there.
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