This flow presents what happens or can happen after that CMS updates a customer record in PAL. In the inital signup process flow, the customer in CMS is created after payment of the subscripton. At that time the phonenumber is allocated.

CMS then updates PAL with the phonenumber. When PAL recives the phonenumber. It will raise an event that the service has been created. This in turn will create a subscription in NBS.