Apparatus and method of determining the status of a requested service

A mobile station for communicating over a wireless communications network, the mobile station including a service call state machine being configured to:

• facilitate transmission over the network of an origination request requesting a service with the network, by transitioning from an originating state, from which the transmission is initiated, to a service state associated with the requested service;
• in the service state, receive over the network, in response to the origination request, a status message of a status of the requested service, said status message unambiguously identifying one of a grant of the request service or a denial of the requested service;
• and
• transition from the service state to a null state in accordance with the received status message.