Disable Stuttering Dial Tone

[trafficking]

When I pick up any of my lines, I get a dial tone that stutters 5 or 10 times before becoming a steady tone.  I've read that it could be a Voice Mail indicator.  I would like to disable this service.

I've tried unchecking all "Voice Mail Indicator" check boxes but I still get the stuttering tone. 

Any help would be greatly appreciated.

[trafficking]

I fixed this issue by unchecking the "MWIEnable" option.  For the OBi508vs this option was found in "Expert Configuration" -> "Phone Interfaces" -> "PHONE X"

For the OBi200 it was in:
"Expert Configuration" -> "Voice Services" -> "SP1"