Patent ID: 6882720

Claim:
A method of operating a computer telephony integration (CTI) system comprising a CTI-enabled switch, and an associated CTI controller coupled to the CTI-enabled switch via a CTI signalling link, the method enabling the CTI controller to maintain a call log of the CTI controller when a call is delivered off-switch by said CTI-enabled switch, the method comprising the steps of: responding to receipt of a call terminating at the CTI-enabled switch, the call being initially directed to an on-switch destination network termination, by: delivering the received call initially directed to the on-switch destination network termination from the CTI-enabled switch to an off-switch destination network termination, and sending to the CTI controller signalling data of the call comprising at least a directory number of the off-switch destination network termination; notifying the CTI controller of an answer condition with respect to the off-switch destination network termination; and in response to notifying the CTI controller, sending from the CTI controller to the CTI-enabled switch a command for invoking a call back when free facility in respect of the directory number of the off-switch destination network termination, wherein responses to said command received by said CTI-enabled switch in respect of said off-switch destination network termination enable the CTI controller to determine when the call is delivered off-switch via a remote switch and to update a telephony state of said off-switch destination network termination in the call log.