I need a pbx style phone system in my business but I dont have the funds for a traditional system. I have a wired/wireless ethernet system already installed throughout my business and was wondering if there was a way to use IP phones through the network internally without an outside VOIP service provider?

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yes...! but an IP phone does nothing unless your are using BOYD...or have a provider!
I use several VoIP and free SIP service and providers....!
you can use magicjack to start....you can use a regular phone with it!
most ( almost all) VoIP provider are not free, but many SIP service are almost free or very little charge.....unless you need calling in/out...
you need your computer always on for SIP service, but with a paid VoIP it goes thru your modem, not the computer....!
the cheapest iPBX I know is this: P8 49.99 a month I get over 40 countries for free....including Europe...
http://www.packet8.net/business_services/service_plans.aspx
MagicJack.com a one time 39.99 free and 19.99 per year the 2nd year around....!
http://www.magicjack.com/site/index.html
I also use skype calling in/out for the rest of the world...I use wifi-max/fixed....its only 16 dollars a month with clearwire.com...