Line outcalling issue

[rial42]

I have a Partner ACS R7 with 2 308 Modules and 1 206 module.
I am having an issue with a touch tone receiver on line 6.
Every 6th call I get a murky dial tone. At this time when I dial on that line button I do not seize the CO Line.
After dialing I get a Bee-boop sound then system busy tone.
Do I have a link issue or a TTR Issue.
How do I isolate the module that's causing the issue.

 

[smokinjoe2938]

1st start by going to the partner forum, sounds like a bad line port