Configuring Asterisk to support a T1 PRI connection

Asterisk provides an open source solution for those who want to deploy VoIP in an organization, but don't want to invest a lot of money in a proprietary solution. After you get the software installed on a server, you have some more work to do. You have to connect your server to an outside voice line. In this article, I'm going to show you how to set up the Asterisk Soft PBX system interface with a T1 PRI connection.

Afterwards, you should be able to install a Zaptel-compatible PRI card, configure it for your needs, and modify your Asterisk dial plan to begin making outgoing phone calls from your internal SIP phones, as well as receive phone calls over your PRI line to your SIP clients.

Author's note

There are many different options for configuring your outgoing trunk, and it's impossible to cover all of the options in the scope of this article. What will be covered is the most common configuration in the United States, which is for a T1 PRI. I recommend that you become friendly with your sales/support representative and tech support, as you should ask questions about what the channel stepping method is, encodings, and D-Channel.

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