https://wdd.js.org/en/categories/all/ Recent content in All on The SIP Lab Hugo -- 0.151.0 en Mon, 09 Mar 2026 18:26:07 +0800 https://wdd.js.org/en/posts/2026/when-you-need-opensips-or-kamailio/ Mon, 09 Mar 2026 18:26:07 +0800 https://wdd.js.org/en/posts/2026/when-you-need-opensips-or-kamailio/ <h1 id="the-simplest-architecture--the-1-node-architecture">The Simplest Architecture – The 1-Node Architecture</h1> <blockquote> <p><strong>1-Node Architecture: 1 FreeSWITCH Node</strong></p></blockquote> <p>In the simplest VoIP architecture, you only need to deploy a single <strong>FreeSWITCH</strong> server with a public IP address to start providing calling services.</p> <p>Extensions register directly to the FreeSWITCH server, and the server connects directly to SIP trunks.</p> <p><img loading="lazy" src="https://wdd.js.org/zh/posts/2026/when-you-need-opensips-or-kamailio/p1.drawio.svg"></p> <p>However, it doesn’t take long before you start encountering the following problems:</p> <h2 id="security-issues">Security Issues</h2> <ul> <li> <p><strong>Direct Internet exposure</strong><br> FreeSWITCH is directly exposed to the public Internet, which inevitably means it will be attacked.<br> While trunk connections can be protected with network policies, extension IP addresses are often dynamic.</p>