Panasonic KX-TD816NZ - Manual (Page 109)

2.9 Using the Display Proprietary Telephone
Operation
109
2.9.2 Recording a Call Log [KX-T7433, KX-T7436, KX-T7230,
KX-T7235 only]
You can record the caller's information in the call log to call them back. If you do not answer the call,
the log is recorded automatically. You can see the call duration during the conversation.
To record a call log
Press “LOG.”
D – PT
During a conversation
LOG