<p>I am a client of the <a href="http://www.optimustag.pt">optimus tag</a> service (for English users, it’s a phone plan that includes free calls for any other phone using the same network plan).</p>
<p>Recently, I discovered they have a <a href="http://www.optimustag.pt/Servicos/Webphone.jsp">softphone like system</a> called Webphone (Windows only), that allows you to place and receive calls, <span class="caps">SMS</span>, <span class="caps">MMS</span>, and other stuff, right from your computer.</p>
<p>My first thought was “this must use some kind of <span class="caps">SIP</span> service”. Since the <span class="caps">SIP</span> settings are not posted anywhere on the internet, and I don’t want to use Windows to use their client, I decided to dig deeper and try to find the <span class="caps">SIP</span> configurations so it can work on any regular softphone.</p>
<p>Although it was easier than I thought (<a href="http://www.wireshark.org">Wireshark</a>, I love you), there is one serious limitation that I couldn’t solve without hacking some open source code. Anyway here’s the main settings:</p>
<h3>Optimus Tag <span class="caps">SIP</span> settings (to use with a <span class="caps">SIP</span> softphone)</h3>
<ul>
<li><strong>server address</strong>: sip.optimus.pt</li>
<li><strong>username</strong>: 351 <em>your number</em>@sip.optimus.pt</li>
<li><strong>password</strong>: your webphone password</li>
<li><strong><span class="caps">SIP</span> proxy</strong>: asbg.sip.optimus.pt</li>
<li><strong>User Agent</strong>: Optimus-SoftPhone/7.0.1.4124</li>
</ul>
<p>Now, the last item is the worst part. If you don’t specify a <strong>User-Agent</strong> that starts with <code>Optimus-SoftPhone</code>, you’ll receive a “403 Forbidden User Agent” message. I tried to find a <span class="caps">SIP</span> softphone that allowed me to change the UserAgent but didn’t found one (I didn’t try hard).</p>
<p>So I decided to take the <a href="http://www.twinklephone.com">Twinkle</a> open source <span class="caps">SIP</span> client, changed the hard coded User Agent, and got surprised when it worked flawlessly from the first time! I tried placing and receiving calls and it worked perfectly :)</p>
<p>If you’re interested on the trivial patch (I used Twinkle version 1.4.2) you can find it <a href="http://gist.github.com/116644">here</a>.</p>
<p>If you know a <span class="caps">SIP</span> client for OS X or Linux that allows me to change the User Agent, don’t hesitate to comment bellow!</p>
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optimus-webphone-sip-settings
2009-05-23T07:41:00-07:00
Optimus Webphone SIP settings