Using Freeswitch with Gizmo and Google Voice

Gizmo now has support for Google Voice, which means you don't need to use GV's web interface anymore to make outgoing calls. You can configure your SIP softphone or ATA to dial using Gizmo to have free long distance calling within the U.S. Alternatively, you can use Freeswitch to treat Gizmo as a trunk through which you can route outgoing calls.

First, setup the profile as follows:

<gateway name="gizmo5">
<param name="realm" value="proxy01.sipphone.com"/>
<param name="from-user" value="174712345"/>
<param name="from-domain" value="proxy01.sipphone.com"/>
<param name="caller-id-in-from" value="false"/>
<param name="proxy" value="proxy01.sipphone.com"/>
<param name="username" value="174712345"/>
<param name="password" value="apple"/>
<param name="expire-seconds" value="3600"/>
<param name="register" value="true"/>
<param name="register-transport" value="udp"/>
<param name="retry_seconds" value="30"/>
<param name="extension" value="174712345"/>
<param name="codec-prefs" value="$${global_codec_prefs}"/>
</gateway>

Second, add the outgoing dialplan so outbound calls go through the gateway:

<extension name="gizmo">
<condition field="destination_number" expression="^(1{0,1}\d{10})$">
<action application="bridge" data="sofia/gateway/gizmo5/$1"/>
</condition>
</extension>

Now to handle incoming calls from Gizmo.. let's say you want to route incoming gizmo calls to extension "1000"

<extension name="Inbound-174712345">
<condition field="destination_number" expression="^174712345$">
<action application="bridge" data="user/1000@$${domain}"/>
</condition>
</extension>

That's it for freeswitch, now you just need to enter your Google Voice account in Gizmo:



Happy calling. :)