Asterisk provides an open source solution forthose who want to deploy VoIP in an organization, but don't want to invest a lot ofmoney in a proprietary solution. After you get the software installed on a server, you have some more work to do. You have toconnect your server to an outside voice line.
In this article, I'm going to show you how toset up the Asterisk Soft PBX system interface with a T1 PRI connection. Afterwards, youshould be able to install a Zaptel-compatible PRIcard, configure it for your needs, and modify your Asterisk dial plan to beginmaking outgoing phone calls from your internal SIP phones, as well as receivephone calls over your PRI line to your SIP clients.