Have the strangest issue. Trying to add a 5th line in the system, I have dialtone at Dmarc, programming changes made in system to add 5th line. Wired it up to red/brown pair, port 225. As soon as I add it to the system, no dialtone-deadair. I checked the trunk cards and both are good, I also removed the cross connect from line 1(known working line) crossed over my new phone number and it works fine?

KSU TC 1 & TC 2 configured as loop
When toner is placed on Red/brown pair line 5, 6 no tone comes thru.
However comes thru on line 1-4 just fine!
JS-HO3 Software Ver1
Any assistance would be appreciated!!