# Presentation: 510674

## The Ongoing Evolution of Numbering

- A look into current and future numbering issues and their impacts on operations and systems

**Telcordia Contacts:**Adam Newman
- Sr. Engineer and INC Vice Chair
- _[anewman@telcordia.com](mailto:anewman@telcordia.com)_
- 732-758-4962
- Gary Richenaker
- Director and ENUM Forum Chair
- _[grichena@telcordia.com](mailto:grichena@telcordia.com)_
- 732-699-3264

- Copyright © 2004 Telcordia Technologies, Inc.; All Rights Reserve red

- FCC Future of Numbering Symposium
- 11/4/2004

## What’s So Important About Numbering?

- A SP customer is tied to all of the back office systems by one common element, a phone number
- Three basic elements tie back office systems to  customers: customer id (often a phone number), address/location, and a phone number
- If these elements change, so does the systems universe.

## Current Numbering Issues

- Intermodal number portability issues
- Technology Specific Overlay and Block Contamination Threshold Petition(s)
- New NANPA Number Administration System (NAS)
- Pooling Administration System (PAS) changes and guideline changes

## Big Numbering Issues on the Radar

- Voice over Internet Protocol (VoIP) Telephony
- ENUM
- NANP Expansion vs. Further Number Optimization
- Location Portability

## VoIP – What are the Numbering Issues?

- Location insensitive
- Local Calling Area/Rate Center Disparity
- International use of NANP numbers
- E911 service issues
- Number portability issues
- Number reporting responsibilities
- Qualifying for number assignments
- Number exhaust effect
- Use with non-geographic numbers
- No consensus at industry as to what are real issues vs. potential issues

## VoIP – What are the Potential Impacts?

- Potential to break the link between rate centers and numbers may cause changes in back office systems
- Need for additional flexibility in back office systems with regard to location e.g., a customer address in NJ could be assigned a CA number in inventory
- Potential need to associate additional information with TN e.g., IP address or other IP network information
- Potential regulatory hurdles with regard to provision of E911 functionality for a service that is not location stable; need for work around or alternate solutions e.g., use of wireless location solutions
- Potential need for changes to call rating, intercarrier compensation, and call billing paradigms depending on regulatory outcome.

## ENUM – What are the Issues and Impacts?

- Are the privacy, security and authentication requirements adequate?
- What are the back office changes required to to map TN to Universal Resource Identifiers (URIs) and other related services?
- Provisioning flow through needs to be implemented
- Billing requirements need to be defined
- The architecture, provisioning, roles and responsibilities for entities for non-geographic NPAs need to be defined
- _[http://www.enum-forum.org](http://www.enum-forum.org/)_

## NANC Number Expansion/Number Optimization Report

- NANP Expansion, as proposed by the INC, will be more expensive than any of the optimization measures
- Expanded NANP
- 			NXX(X)-(X)NXX-XXXX
- 			(ABCD-EFGH-IJKL)
- Plan calls for d-digit release consistent with implementation and a 0/1 will appear in the d-digit to indicate new NANP format dialed.  New F digit remains 2-9 only to allow for future expansion.
- Regulatory approval required by all NANP regulators prior to implementation
- Implementation activities suggested to begin 10 years in advance

## Number Expansion/Number Optimization Report Conclusions

- Only four examined measures, based on the specific measure’s assumptions, offer potential in delaying NANP exhaust significantly (more than 5 years).
- Rate Center Consolidation, D-digit Release, Transparent Numbers via Geographic Portability, Individual Telephone Number (ITN) Pooling
- One or more measures may be combined for potential additional benefit dependent on existing conditions.
- Report’s approach and methodology should assist in evaluating future numbering resource optimization choices and decisions.
- Transparent Numbers via Geographic Portability and ITN Pooling deemed excellent candidates for further analysis and implementation. The NANC requested direction from the FCC on such further analysis.

## Location/Geographic Portability

- Distance based routing and call location information for both origination and termination are rapidly becoming anachronisms
- Most of the thorny issues for VoIP, intermodal porting, and number optimization are about location identification and ties to rate centers
- This is the sticky wicket to be resolved in the next five years that most of the other big issues hinge on.
- One potential SS7 based signaling solution published in a Telcordia Generic Requirement has been available for seven years