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OpenPBX
The OpenPBX is an Open Source Linux PBX written entirely in Perl. It interfaces to the OpenSwitch telephony cards via the CT Server middleware described below. The code is very compact, only 1000 lines of Perl code are required for the basic PBX functionality. This made development extremely rapid, compared to using traditional approaches like C/C++. It also means the PBX is very easy to extend and customise, for example add unlimited voicemail boxes, or a custom IVR menu ("Press 1 for Sales, 2 for Support....") with a small amount of Perl code
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