Detailed instructions for installing and configuring Asterisk and FreePBX from scratch. Our Linux OS of choice is Redhat Enterprise Linux or one of the recompiled versions. Our SIP phone brand of choice is Aastra. Our zaptel card manufacturer of choice is Sangoma. We believe this combination will create a best in class Asterisk based VoIP PBX for production business environments. If you require our services fell free to contact us.