...+ Global trading communication systems, compliance solutions, and network services provider IPC Corp. faces narrowing covenant headroom following weaker-than-expected operating performance and continued covenant step-downs. + We are lowering our corporate credit rating on IPC to 'B-' from 'B', and removing all ratings from CreditWatch + At the same time, we are lowering the issue-level rating on IPC's first-lien debt to 'B-' from 'B'. The recovery rating remains '3'. + We are also lowering the issue-level rating on IPC's second-lien debt to '###+' from 'B-'. The recovery rating on this debt remains '5'. + The negative outlook reflects narrowing covenant headroom as modest deleveraging is offset by continued covenant step-downs. NEW YORK (S&P Global Ratings) June 12, 2017--S&P Global Ratings today lowered its corporate credit rating on Jersey City, N.J.-based IPC Corp. to 'B-' from 'B'. We removed all ratings from CreditWatch, where we originally placed them with negative implications on...