Patent ID: 8804932

Claim:
A method of controlling access of a mobile communication device, capable of issuing a unique identifier for identifying the device, to a calling line identification (CLI)-based service on a communication network via a connection from outside the communication network, comprising: if the identifier is received from outside the communication network and over a secure signaling channel, storing in a memory a first time stamp, representative of a first time of receipt of the identifier; setting up the connection and generating a second time stamp representative of a second time at which the connection is established to the CLI-based service on the communication network; issuing a first instruction to establish unconditional access of the device to the CLI-based service if a time difference between the second time and first time falls within a predetermined time window threshold; and issuing a second instruction to grant conditional access of the device to the CLI-based service if the time difference falls outside the predetermined time window threshold.