Some services are tariffed, deployed in the network, and generate revenues.
Others are in market or technical trials, getting ready for deployment. There are other services that are either planned for deployment or were developed for demonstration purposes. The subscriber may either preselect an ISP for automatic routing or request block calls to ISPs. With the AIN, when a call to a selective routing customer is forwarded, the SCP determines where to route the forwarded call based on the caller's number. A virtual telephone number is assigned to the personal access service subscriber.