Cross product/service management of subscriber products/services is provided. When multiple product/services orders or instructions are received for a shared service or resource (e.g., a unified voicemail box/system) from two or more order or instruction entry systems (e.g., wireline and wireless telephone systems), the multiple orders or instructions are passed to a shared product/services provisioning manager for management of the orders or instructions with respect to the shared service or resource. If the orders require a change to the shared service or resource, the orders or instructions are mediated for concurrent or otherwise conflicting requests to the shared service or resource. Mediated requests are formatted for receipt and use by the shared service or resource and are then passed to a network element responsible for the shared service or resource for implementation.