There's really no right answer to this question of whether to deploy an on-premises or cloud-based IP-PBX system,...
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other than it depends on your organization and how long you plan on keeping the system. From the research I've done, the break-even point for an on-premises-based system versus a cloud UC product is about 48 months. That means, if you plan on keeping the solution more than four years, the on-premises system becomes cheaper than cloud.
I believe cloud UC is superior if you have a lot of mobile workers. In my opinion, cloud services are much better suited to meet the demands of mobility, as the services can be delivered to anywhere over any network. Also, if you're in an environment where there are a lot of "off net" workers, a cloud product can address this without the need for VPN connections.
If there are specific features or some kind of custom implementation that you require, however, an on-premises-based system may be the better choice. If you're planning to use the incumbent vendors, the on-premises system may provide an easier path to implementation.
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