Caller ID is only displayed when using a voice modem which supports caller ID.
1. Your voice modems might not support caller ID (not all do). Check your modem manual. 2. Your phone system may not have caller ID (sometimes you need to pay for the feature). 3. If you are using a PBX extension, your PBX might not support caller ID.
If you are in doubt about whether TRx Phone Recorder will do what you want we recommend you try the free download. Seeing the program in front of you often answers most questions