I have noticed that many people, in particular those who have a telephony background or were working with common IP PBX solutions, try to match their gained dialplan know how, that they acquired over the last couple of years with many, many PBX/IP PBX
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Read the complete post at http://blogs.technet.com/jkunert/archive/2008/08/15/ocs-2007-dialplan-fundamentals.aspx