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Tier1
- Respond to service inquiries
- Facilitate issue resolution
- Manage trouble tickets
- Monitor network for alarms and traffic issues
- Resolve individual number routing issues
- Block and unblock trunk groups
Tier2
- Troubleshoot issues with customers and suppliers
- Research issues with call traces, ethereal traces and CDR research
- Analyze issues to identify common causes and relationships between issues
- Work with loop providers to research issues
Tier3
- Address interopt with switch manufacturer
- Coordinate patches to resolve issues
- Analyze IP issues by reviewing system (e.g. UNIX and router) logs
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NOC 
