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Cloud calling, the way you want IT CallTower is a Cisco Certified Calling Provider enabling Cloud Connected for Webex Calling. Customers can use CallTower for their PSTN access. Our exclusive partnership seamlessly interconnects CallTower to enable Webex Calling customers to have economical and reliable global PSTN in the cloud – without the need for any premises-based SBC/gateway. A dedicated cloud instance option based on the UCM architecture With a Dedicated Instance, Webex Calling provides customers with a non-disruptive, seamless migration path to the cloud. Webex Calling customers have the flexibility to distribute users across multi-tenant and Dedicated Instance call control and adjust them over time as needed to address their cloud calling business requirements.