This is asked some often. if you had searched before asking:
Cisco doesn't support this feature (call waiting annucation to caller), and has not announced plans to do.
Cisco will tell you that the other chocie is to received a busy singnal, (thing that will rpeved the calle to know about the missed call).They also will tell you that you canconfigure presence and/or espansion modules to monitor other extensions status.
I've created a TCL/IVR script that provides the funcionality, with the drawback of requiring an additional button on the the 'phone A' . This limitation does not exists on CME. It can be adquired at the website mentioned in my profile.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...