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<h1>Calling the PSTN with SDF VoIP</h1>
<p>You first need to be an ARPA member, which costs $36. It's a one time
payment, and then you're an SDF member for life! Then it's just $15/qtr for unlimited
calls anywhere in the world.</p>
<p>Follow the steps on the <a href="https://sdf.org/?tutorials/sdf_voip">VOIP tutorial
page</a> to get your SIP account set up with your app/phone of choice.</p>
<h3 id="calling-north-america">Calling North America</h3>
<p>Calling North America is easy. You just need to prefix the 10-digit number with a
1. For example: 1 (208) 555-1234 It <strong>does not</strong> need a + in front. This
will cause the call to fail. The same thing will happen if you do not have the 1 out
front.</p>
<h3 id="calling-internationally">Calling internationally</h3>
<p>I have called Europe a few times now. For those of us in North America, we are used
to prefixing European numbers with +011 or 011. <strong>You don't need to do
this</strong> when calling Europe. For example:</p>
<p>Calling Norway, country code 47: 47 585 66 972</p>
<p>So the country code followed by the 8 digit phone number... Pretty simple!</p>
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