I have searched the forum and found many posts regarding the non-functioning of the the Caller ID/Call log. I have a H24-100 and it works fine for the Caller ID. I also have a H25-100 and the Caller ID setup looks exactly the SAME. The option is there just like on the H24. YET, it simply does NOT work (the Call Log) on the H25. What kind of nonsense is that - to clearly show that the "option" IS available, and then there is NO way that you can get it work ??? Shame !!