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Please press "Feature 59" on a display phone. That will tell us the release of the phone system. Your system may not be caller ID capable.
The reason you are getting caller id on your cell, when the phones are forwarded is because you are paying for caller ID on your cell phone....and your cell phone is caller ID capable.
The KX-T7731 is a proprietary system phone. You have a Panasonic phone system. Caller ID is transmitted between the first and second ring but the phone system itself is the only part that gets this information. The system has to be compatible for caller ID and it has to collect the caller ID data and send this information to your phone(s).
Your phone can be used on many different Panasonic phone systems. The phone's part number does not help you. First thing you need to do is find out what system you have and if it has caller ID. The phone system part number should start with KXT like your phone.