March 10, 2005

To:  	Bob Hall
        	ATIS PTSC Chair

	Mike Fargano
	ATIS TMOC Chair

	Gary Richenaker
	ENUM Forum Chair

	Karen Mulberry
	ENUM LLC Chair

	Allison Mankin
	IETF Transport Area Director

	Jon Peterson
	IETF Transport Area Director

	Karen Mulberry
	NANC Future of Numbering Group Co-Chair

	Hoke Knox
	NANC Future of Numbering Group Co-Chair

Subject:  North American Numbering Council Local Number Portability Administration Working Group 
(NANC LNPA WG) request for information regarding VoIP service


Questions regarding VoIP service and requirements for porting those numbers come up in many of the
 LNPA WG monthly meetings.  Currently, a software Change Order has been submitted to the LNPA 
WG, which would permit URI data on the records in the Number Portability Administration Center (NPAC) 
database. Since most numbers used for VoIP service will be Ported or Pooled numbers, and the NPAC is 
an industry wide system, it would appear that using the NPAC for this purpose would be beneficial to 
the industry. 

During the process of considering this proposed NPAC Change Order, we have found it difficult to 
research VoIP processes due to the limited information available, so we are reaching out to other 
Telecom groups and committees to ask that any existing knowledge be shared.  Could you provide 
the LNPA WG input as to what assumptions your group is making in the development of VoIP or 
ENUM-related standards/processes with regard to the availability or need for VoIP URI data in an 
industry wide system.  

We are particularly interested in the Uniform Resource Indicator (URI) associated with each ported 
or pooled TN.  In addition, are there potential problems and/or benefits associated with the inclusion 
of that data in the NPAC?  And, since the LNPA WG is considering the addition of such data in the 
NPAC, would you provide input as to whether the availability of that data might have repercussions 
on the standards or processes for which your committee is responsible. 

Your response is respectfully requested by April 8, 2005.

Gary Sacra
Paula Jordan

LNPA WG Co-Chairs