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<h1 id="using-t1">Using T1</h1>
<p>How to connect a lot of analog phones, and even modems, using T1.</p>
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<!--
dell: Dell Optiplex
server -> dell: IAX2
tdmcard: Digium TDM410P
dell -> tdmcard: PCI
phone2: Rotary Phone
tdmcard -> phone2: FXS
cisco: Cisco SPA506g
server -> cisco: SIP
-->
<p>The diagram above illustrates the flow of an incoming call to the system. First, the call from the Publically Switched Telephone Network (PSTN) is routed through our Session Initiation Protocol (SIP) service provider, mine is Twilio. Twilio communicates with an Asterisk server via SIP, I use a small VM hosted on AWS for SIP termination for two reasons:</p>


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<pubDate>Sun, 27 Sep 2026 15:22:32 -0500</pubDate>
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