>> Service providers deploy carrier-grade equipment designed for "Five-9s" operation.  This level of reliability can't be built into PBX products at prices that enterprises are willing to pay.

>> Service providers build fault-tolerant, highly reliable networks by ensuring redundant links between network elements.  This level of redundancy would never pass the budgetary review process of an enterprise.

>> Service providers hire and train technology experts to engineer, install, maintain and manage the network.  Many outages of PBX equipment are caused by "operator-error" during upgrades or maintenance.

>> Redundant broadband access facilities are most cost-effective because the facilities and their backups can be shared for both voice and data.  A pair of transports can be configured in a load-balanced and shared configuration providing double the capacity for voice and data traffic under normal operation yet maintain service if one of the transports fail

>> If a user does become unreachable due to an access failure, the service identifies this and automatically routes inbound calls to an alternative destination (i.e., voicemail or an alternate number).  Your customers will never hear a service disruption announcement and think that you have gone out of business.

>> Configuration and provisioning information is maintained at the service provider on redundant systems and in "hardened" facilities.  In the event of a disaster at the customer-premise, service can be quickly and easily restarted at an alternate location.

>> Mission-critical organizations can establish "shadow" offices and instantly move all telephone numbers and services to their alternate location without service provider intervention.

>> In the event of a disaster at the customer-premise or if employees simply cannot get into the office, employees can work at home using their broadband connection with an IP phone, by routing calls via the Web Portal or by enabling Remote Phone for use with their home phone/mobile phone