There are numerous reasons to limit or otherwise block the origination of outgoing calls. Parents may want to limit their children's ability to call certain people, or make certain types of calls. Further, parents may want to limit the times at which calls can be made. Office administrators or business owners often desire to impose similar limitations on employees.
Unfortunately, there are very few ways to limit outgoing calls. Typically, a telephony switch servicing a telephony terminal must be provisioned to block certain types of calls from that telephony terminal. Such provisioning is generally limited to blocking broad categories of calls, such as 900, long distance, or international calls. In addition to being limited to blocking certain categories of calls, such provisioning requires subscribers or their representatives to request that the service providers provision the telephony switch in the desired fashion. Accordingly, current techniques for blocking certain types of outgoing calls are not only inflexible, but also cumbersome. There is a need for an efficient and flexible way for subscribers or their representatives to block outgoing calls as they desire, as well as a telephony system in which such blocking of calls can be efficiently implemented.