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Make unlimited SIP calls to Google Voice number [Tutorial]

By Alok Saboo on March 6th, 2011

UPDATE (15th March 2011): After a brief outage the Google Voice SIP URI is working again :)

For an otherwise great great service, the lack of interoperability with SIP service mars the attractiveness of Google Voice. Up until recently, Google offered the ability to forward the Google Voice number to a Gizmo account, providing some way to extend the reach of GV. However, Google announced the termination of Gizmo5 service starting April 3, 2011. For many of us, using Gizmo5 to use Google Voice services on ATA or other soft phones, this is a huge blow. We recently reviewed Talkatone that lets you use Google Voice over 3G or WiFi without using local plan minutes. In this tutorial, we provide you another way to make calls to any Google Voice number using a SIP account for FREE. This tutorial is based on findings by Todd Vierling and is intended to be a step by step guide to call Google Voice numbers using SIP.

No Gizmo5 connection from Google Voice

As you would expect, you need a SIP account and a SIP client (ATA or a SIP softphone) to make SIP calls. So, let’s get started…

Step 1: Create a FREE SIP account at

Although any SIP account should work, I used Sip2Sip for this tutorial. If you don’t already have one, create a FREE account at Sip2Sip. For a free service, Sip2Sip is extremely capable service from AG Projects. (more on that in a separate post). Logo

Step 2: Configure your SIP client

Now you need to configure your SIP account with a SIP client (ATA or SIP soft phone, e.g., x-lite). Please note that your SIP client should be able to dial SIP URIs. You can even use a mobile VoIP (mVoIP) client such as Media5-fone iPhone SIP client.  For the purpose of this tutorial, I am using Blink.

Blink FREE SIP client logo

Blink is a very powerful SIP client and is well integrated with Sip2SIp, making it an ideal choice for this tutorial. You can download Blink here (both PC and Mac versions are available). Just enter your Sip2Sip account details and you are ready to make SIP calls, no need to enter any other SIP configurations.

To make SIP calls to Google Voice, just dial, where XXXYYYZZZZ is the Google Voice number that you need to dial. Just dial the SIP URI and you will be connected with the Google Voice number that you dialed. The screenshots below will help:

Blink free SIP client Blink make SIP calls to Google Voice Blink make SIP calls to Google Voice

Like everyone else, I am hoping that Google will provide SIP connectivity directly inside Google Voice so that we do not have to use such tricks. Till that happens, I am sure you will enjoy this trick to make free SIP calls to Google Voice without using local plan minutes.

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  • Kevin N

    Any program you know of for this to work on Android?

    • Alok Saboo

      Sure, you can use the same trick using any Android SIP client that supports SIP URIs, e.g., SIPdroid.

    • Enduringgrowth


  • Alok Saboo

    I tried this with my other account that does not have Gizmo5 associated with it and it worked, so I am not sure if that is the case. We can try one thing, you can use the contact form to send me your GV number and I can try dialing it from here. Hopefully, it will provide us with some guidance….

  • Alex

    Same here.. doesn’t work for me either.. tried 3 different GV accounts from 3 different SIP account (Gizmo, Sipgate, Whistle). In all cases, it times out when attempting to place a call.

    • Alok Saboo

      Thanks for pointing it out!!

      It may be a temporary blip or it is also possible that Google has plugged the hole. Will test it out and let you know.

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  • Sarankanna

    Alternative SIP methods for Roaming (abroad)

    Method 1: GV –> IPkall 425 –> LP sip # –> Mobile Fring / Any sip client (X-lite)

    Method 2: GV –> SipGate US # –> SG sip # –> Mobile Fring / Any sip client (X-lite)

    Method 3: GV –> LP US DDI # –> LP sip # –> Mobile Fring / Any sip client (X-lite)


    • Alok Saboo

      Thanks for the tip, much appreciated!! For those who do not want to go through the entire document, the idea is to get a DID and then configure the SIP account on any SIP client.

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  • VoIP Watch

    It is down again.

    • Alok Saboo

      Thanks for the note….yes looks like it is down again :-(

      I (continue to) hope that Google will come up with an easier alternative to enable Google Voice-SIP interoperability.

  • Jaimin Rajani

    Google Voice SIP Calling Working Again with a simple tweak:

    • Alok Saboo

      Thanks for the note….will check it out :)

  • Alok Saboo

    I am not sure about the people behind the service and will not advocate you to submit your primary Google account details here. Meanwhile, I will try to explore this option and will let you know the results.

  • Anonymous offers this service too, afaik.

  • Alex -  Is better and cheaper :)

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