The main difference between hosted unified communications and on-premise phone systems that support unified communications is that hosted solution are physically located at the communications service provider facilities rather than the customer's location.
The typical small to mid-sized business may not necessarily need all functions associated with unified communications but often times the minimum investment required for purchasing and maintaining on-premise solutions does not prove to be most cost effective for the dynamic nature of SMB businesses - this is where hosted unified communications can flourish.
Whether your business requires only dial tone or a full implementation of unified communications solutions, exploring the hosted option makes sense on many levels.
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