It's available for some variants. I bought my phone from Bahrain and it didn't had call recording option. Once I reached India I had factory reset my device with an Indian sim card inserted. After that I got the option to record calls.
Hi dear, Call recorder is available in note 9, unfortunately it's a CSC based option. Built in call recorder is available in devices sold in India.
I am using a Note 9 which was purchased from Bahrain. It didn't had option to record calls. When I went India for vaccation I had reset my device with an Indian sim card inserted in the device.. After reset was completed and the device turned on, there was a message on screen asking whether I want to set my phone to the sim card defaults. I pressed yes and my Device turned off. Once it turned on, my device got call recorder and I lost double press power to open camera.
If you wish to get call recorder I can help you to change your CSC to indian version and to get built in call recorder.