Microsoft
No one VoIP vendor has sparked more debate than Microsoft, storming the market a couple of years back with its Office Communication Server (OCS) offering and essentially calling for the death of the PBX. Well, Microsoft's software-driven approach to VoIP is gathering steam and some companies are going PBX-free. In the VoIP world, you're either for Microsoft or against it, and enough VARs queried for Channel Contenders said they're for it and see it as a strong alternative vendor.
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