Carriers Porting Telephone Numbers May 1, 1999 View

1
Acquisition and Administration of Extended/Expande
d Calling Scope Numbering Resources
Key Points EAS and Non-EAS Numbers

• Terminator cannot control how originator rates
  calls at TN level
• Originator screens NPA-NXX for local/toll
  characteristics, then sends
• No currently available technical solution exists
  to change inbound call rating with geographic
  numbers
• Residential consumers more likely than business
  to want non-EAS
• Thousands-block Number Pooling will recover
  unused blocks, and Sequential Number Assignment
  will preserve these blocks
• TX (528) MO (178) have 88 of EAS NXXs (8 of
  the top 100 MSAs)
• 14 States have EAS arrangements, per LERG 6 (SCC
  J)
• AR, CA, CT, GA, ID, KS, MO, NC, ND, NM, OH, OR,
  TX, VA
• 9 States have only 1 or 2 Rate Centers with EAS
• Dallas Houston are scheduled for Pooling in
  2001 with many EAS arrangements

2
Inbound Dialing Patterns to EAS and Non-EAS
Numbers

• CURRENT PROCESS
• Switch 2 captures dialed digits from B
• Digits compared to local NXX table
• If NPA-NXX is local, rate/route local
• If not, route to IXC, rate accordingly
• Terminate to Switch 5, E (local) or F (toll)
• ASSUMPTIONS
• Inbound calling scope mirrors ILEC structure
• Call processing is standardized among LECs
• Routing determined at the originating switch

Arlington Rate Center
817-449-1234
EAS
Native 449, 505
817-505-4035
Non-EAS
Euless Rate Center
3
Inbound Dialing Patterns to EAS and Non-EAS
Numbers
Arlington Rate Center
817-449-1234
EAS
Native 449, 505
817-505-4035
Non-EAS

• Calls to E from A-D are local
• Calls to F from A-D are toll

Euless Rate Center