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The MCK EXTender 4000 provides a teleworker or a home-based call center agent with the same digital telephone set and access to all the features they have in the corporate office or call center. By sending the voice traffic and signaling over a managed IP network back to one of MCK's EXTender PBXgateways located at the corporate site, the MCK EXTender 4000 allows voice traffic to be seamlessly carried over an existing data network.