[VoiceOps] CenturyLink and Neutral Tandem Contacts

I was experiencing some problems with multiple inbound calls for each placed call and I put in a ticket with our tandem provider (Frontier). Frontier said they were seeing the multiple calls coming in from CenturyLink and Neutral Tandem. They gave me point codes and some other number I didn't recognize (TSC GNxxxxxx). Unfortunately, I only have mass-market customer facing support numbers (well, just for CenturyLink). Does anyone have a better contact at those companies? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com