Patent ID: 7194250

Claim:
A method of providing a credit card calling (CCC) service in a customized applications for mobile networks enhanced logic (CAMEL)-based universal mobile telecommunication system, the method comprising: (a) a service switching function (SSF) receiving a service access code (SAC) and a credit card number (CCN) dialed by a CCC service user and sending an initial detection operation InitialDP to a global system for mobile communication (GSM) Service Control Function (gsmSCF); (b) a new dialogue initiates and a service logic program instance (SLPI) is invoked; (c) the SLPI requesting a connection between the gsmSCF and a specialized resource function (SRF); (d) the SLPI receiving a personal identification number (PIN) from the SRF; (e) the SLPI sending a search operation to a credit card issuer's database so as to receive information regarding whether the PIN is valid; (f) when the PIN is determined to be valid as a result of searching of the credit card issuer's database, the SLPI receiving a destination number from the SRF; (g) the SLPI requesting the SSF to send a report regarding a Basic Call State Model (BCSM) event; (h) the SSF arming event detection points (EDPs) in response to the request for the report regarding the BCSM event; (i) the SLPI requesting the SSF to disconnect a connection to the SRF in response to the arming of the EDPs; (j) the SLPI requesting the CCC service user who holds the destination number to make a call connection; and (k) when the SSF arms the EDPs indicating that a connection to the CCC service user or a called party is disconnected, the SLPI requesting the SSF to bill the CCC service user for the CCC service.