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It is typical for enterprises to rely on services from cloud providers in order to build a scalable platform with abundant available resources to satisfy user demand, and for cloud providers to deploy a number of datacenters interconnected with high-capacity links, across different geographical regions. In this paper, the authors propose that video conferencing, even with its stringent delay constraints, should also be provided as a cloud service, taking full advantage of the inter-datacenter network in the cloud. They design Airlift, a new protocol designed for the inter-datacenter network, tailored to the needs of a cloud-based video conferencing service.
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