How do I configure the product to work with an answering machine?
Go to Setup > Fax Setup > Fax Recv. Setup > Rings to Answer, and set the product's rings-to-answer to at least one ring more than the number of rings set on the answering machine. Then go to Answer Mode and select TAM; with this setting, the product listens for fax tones after the answering machine picks up and will take over the call if fax tones are detected. (Page 46)
From the official HP Laserjet Pro Mfp M127fn manual, page 46
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