Changing the Number of Rings on Voice Mail

[frkaz911]

My phone has begun to go to voicemail on the second ring without any changes made on my part.   A now-closed forum post on the subject advised to go to the advanced settings,  and I recall doing that when I first set up my voicemail some years ago,  however there's no longer an option to change the number of rings in the advanced settings prompt. 

[tns2]

which Service.  It definitely is still ther in the FIOS phone page.