An exemplary embodiment of implementing a communications service in a Public Cloud system comprises the steps of: (i) registering, by a Maintenance Management application of the communications service, to receive notifications for maintenance events scheduled for virtual machines and/or servers of the Public Cloud system being used to implement the communications service; (ii) receiving, by the Maintenance Management application, a maintenance notification indicating a first virtual machine is to undergo a maintenance event; (iii) determining, by the Maintenance Management application, public IP addresses being hosted by a first Packet Front End application executing on the first virtual machine; and (iv) notifying session control applications of the communications service to drain the determined public IP addresses being hosted by the first Packet Front End application.