Subject: RE: [Enum] GRX ENUM

From: "Yu, James" <[email-masked]>
Date: Wed, 16 Jun 2004 13:13:49 -0400

<SPAN 
class=684111716-16062004>Kim,
<SPAN 
class=684111716-16062004> 
No, it 
is just a possibility because there is no carrier ENUM infrastructure in place 
for the carriers yet.
<SPAN 
class=684111716-16062004> 
<SPAN 
class=684111716-16062004>James

  <FONT face=Tahoma 
  size=2>-----Original Message-----From: Fullbrook Kim (UK) 
  [mailto:Kim.Fullbrook at O2.COM]Sent: Wednesday, June 16, 2004 5:41 
  AMTo: 'enum at ietf.org'Subject: [Enum] GRX ENUM 
  
  A previous message mentioned the use of ENUM on the GSM GRX 
  network for routing MMS messages.  Can anyone comment on the extent to 
  which this is in use ?  The latest version of GSMA document IR.52 
  mentions the use of ENUM in MMS but it's on a fairly localised level rather 
  than anything GRX-wide.
  Kim. 
  -----Original Message----- From: Yu, 
  James [mailto:james.yu at neustar.biz] 
  Sent: 12 June 2004 15:26 To: 
  'richard.stastny at oefeg.at'; 'sdlind at att.com'; 'richard at shockey.us'; 
  'enum at ietf.org' Cc: 'jseng at pobox.org.sg'; 
  'mah at eunet.at'; 'paf at cisco.com' Subject: Re: [Enum] 
  User ENUM vs Operator ENUM 
  One example/use of carrier ENUM is to retrieve the routing 
  number/prefix for a ported phone number.  End 
  User ENUM will not have this NAPTR RR (end user will 
  not have the knowledge to put in the info.). 
  As Richard mentioned, carriers use carrier ENUM for 
  inter-carrier communication/routing (e.g., identify 
  the MMSC for a mobile phone number or the SIP URI for 
  receing incoming INVITEs).  So carrier ENUM contains NAPTR 
  RRs for the phone numbers served by the carriers.  A 
  carrier can put in the service info. only for the 
  phone numbers it serves.  In end user ENUM, an <FONT 
  size=2>end user can put service info. associated with many carriers 
  and/or non-carrier service providers (e.g., those who 
  don't assign phone numbers to their 
  subscribers). 
  General public may not access NAPTR RRs in carrier ENUM.  
  Access control can be applied to carrier ENUM to block 
  unauthored access.  Also the access can be 
  retricted to private-IP networks if the carrier community decide so 
  (e.g., carrier ENUM's DNS servers can only be accessed via 
  private-IP networks such as the GRX in GSM/GPRS and 
  the CRX that is discussed among the CDMA carriers. 
  
  James <FONT 
  size=2>-------------------------- Sent from my 
  BlackBerry Wireless Handheld 

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