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AT&T Answering Machine 1721, want to increase rings?

This answering machine answers after 2 rings.
I would like to increase the number of rings before
answering. I can't find a manual on it. Thanks for any help.

Reggie
October 2010
AT&TAT&T 1721Telephones, Answering MachinesAnswers Find Manual
There is a switch to change number of rings on the upper SIDE, above where the phone cords plug into the machine. Options are 2, 4, and TS.

Person
May 2017

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