CTI functions can assist an application which needs to track devices (telephones) directly connected to Communication Manager. If you are inquiring about the ability to track calls placed in the PSTN (e.g. through a cell phone), that is not possible unless they involve a device on Communication Manager. There are services (applications) that a cell phone can utilize that cause the phone to interact with Communication Manager and then those interactions trigger the PBX to place a call to the cell phone, and some other party. That class of calls can be tracked.
The actual methodology to track calls occurring at devices attached to Communication Manager is to place a device monitor on the device. Depending on the type of events you wish to track different monitor types are used. To track call abstract events (placed a call, call is ringing, call is answered, call is held, call is dropped), a call control monitor should be used.
I am not sure that answers your question. If not, perhaps an example would help me know what type of events, and what type of device you are interested in.
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