We all know that computers, generally speaking, have not been as reliable as phones. And the fear, uncertainty, and doubt (FUD) surrounding voice over Internet protocol (VoIP) has been, in some cases, justified. However, for VoIP the question now is not whether reliability can be achieved, but rather how much reliability you can expect from the options available to you.
at each site. The VoIP solutions that have been evolved out of these legacy voice switches have inherited some of the inherent fragmentation of this centralized and hierarchical architecture. One approach is to put a centralized IP PBX at the main site provisioning dial tone over an IP backbone to IP phones at the remote locations. If the WAN link goes down, the IP phones become useless, so availability assurance can be increased by installing a small standby IP PBX at each remote site. This device might