According to the manual, the RCA 25413 does not support Caller ID. I have provided a link where you can download the manual. The manual is for model numbers 25413 and 25414. On page 8 it details how to turn caller ID on/off for each line under Ringer Tone heading item 6 Note, but the note says it does not apply for model 25413. Hope this helps.
http://www.rca4business.com/products/pc/pdf/instruction-book/25413RE3.pdf
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