pix you may still not have to buy a whole new box depending on what pbx you have if its a newer on there may be an upgrade for it to make it a voip switch get a full T and if its upgradeable change the cards out and boom there you go but if its and older switch more than likely you cant do this. We install 3-coms voip system and cisco and avaya the 3-com is great for small buissness you can have a few as five phones and as many as 100 and its not real pricey either
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