How to get and use your google voice (GV)

Google voice has been offered unlimited free calls and SMS to USA and Canada (Landline and mobile) for a very very long time, google voice gives a USA virtual number to receive SMS and incoming calls worldwide, just amazing, how powerful google is!
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SipBri adds a SIP account for your google voice (GV)

SipBri.com offers bridge service that will connect your VoIP phone or mobile SIP application with Google Voice™ so you will be able to make calls to the USA and Canada for FREE!* by Using your SIP Clients or Voip device. 

Free Calls to US/CA | Hangouts in Google+ | also free video calls

As I assumed, Google+ added the Free Calls to US/CA landline or mobile phone now, see the below picture:

The above picture showing that, when you are in the video chat room of Hangouts, you can make Free Calls to USA/CA by click the phone button on the left.

Sipsorcery also can let you have a SIP to your google voice (GV）by using IPKALL

Here we talk about how to add your sipsorcery SIP to your google voice to make outgoing call and receive incoming calls on your sip clients or voip device or voip phone.

1. Register a IPKALL account and get a virtual USA number, IPKALL offers a free USA virtual phone number routed to SIP.

Add a SIP to your google voice (GV) by Teltub

You can now use gHome service from Teltub free for one month (valued at $5). gHOME here means Transform Your Google Voice™ Into a Home Phone to call USA/CA unlimited free for one month with SIP account for your google voice (GV). That's supper Cool!

Details below:

Bobsled by T-mobile, makes free call to USA, CA and Puerto Rico and your facebook friend

FREE CALLING
Bobsled lets you make free calls to your Facebook friends and any mobile or landline number in the U.S., Canada or Puerto Rico. It's absolutely free, even from overseas!

Tropo is PERFECT for free voice call and virtual numbers

I've been used tropo free account as a developer for quite a time, and found it was such a great service, I am not that good at writing code but also can use Tropo with the help of my friend. 

Tropo is a powerful yet simple API that adds Voice, SMS, Twitter, and IM support to the programming languages you already know.

Sign up for an account (It's Free!)

Create an application and get a phone number (also free)

Make a phone call (still free)

Send a text message (yep, still free)

Here I share my experiences about using tropo in the voice app, such as use SKYPE to call free international call:

Twilio - Free API Trial - Free $30

http://www.twilio.com/

Twilio provides infrastructure APIs for businesses to
build scalable, reliable voice and text messaging apps


Free Services: 
1. offer a free US or CA number with an extension;
2. Offer USD30 for phone call to US and Canada, totally 3000 minutes;


I built an Example as the picture show as below: click here