GSM Association Non Confidential Official Document IR.67 IR.67 - DNS/ENUM Guidelines for Service Providers & GRX/IPX Providers 6.0 1 December 2011 This is a non-binding permanent reference document of the GSM Association. Security Classification – NON-CONFIDENTIAL GSMA Material Copyright Notice Copyright © 2011 GSM Association Antitrust Notice The information contain herein is in full compliance with the GSM Association’s antitrust compliance policy. V6.0 Page 1 of 78 GSM Association Non Confidential Official Document IR.67 Table of Contents IR.67 - DNS/ENUM Guidelines for Service Providers & GRX/IPX Providers .......... 1 6.0 ............................................................................................................................... 1 1 December 2011 ....................................................................................................... 1 1 Introduction ...................................................................................................... 5 1.1 Overview ..................................................................................................... 5 1.2 Scope .......................................................................................................... 5 1.3 Definition of Acronyms and Abbreviations ................................................... 5 1.4 Definition of Terms ...................................................................................... 6 1.5 Document Cross-References ...................................................................... 7 2 DNS As Used on the GRX/IPX ......................................................................... 9 2.1 Introduction.................................................................................................. 9 2.2 Architecture ................................................................................................. 9 2.3 Domains .................................................................................................... 12 2.3.1 Introduction................................................................................................ 12 2.3.2 General ..................................................................................................... 12 2.3.3 Domain names used on the GRX/IPX DNS ............................................... 13 2.3.4 Domain names used on the Internet DNS (and owned by GSMA) ............. 22 2.3.5 Domain names used on the GRX/IPX DNS for UNI ................................... 26 2.4 Non-service specific hostnames and domains ........................................... 29 3 General DNS Configuration for Service Providers ...................................... 30 3.1 Introduction................................................................................................ 30 3.2 DNS Server Hardware ............................................................................... 30 3.3 DNS Server Software ................................................................................ 30 3.4 DNS Server naming ................................................................................... 30 3.5 Domain Caching ........................................................................................ 30 3.6 Reverse Mapping ...................................................................................... 31 3.7 Use of DNS Interrogation Modes ............................................................... 31 3.8 Use of the GRX/IPX Root DNS Server ...................................................... 32 3.9 Provisioning of Service Provider's DNS servers ......................................... 32 3.10 Resource Records ..................................................................................... 32 3.11 Support for IPv4 and IPv6 .......................................................................... 32 4 DNS Aspects for Standardised Services ...................................................... 33 4.1 Introduction................................................................................................ 33 4.2 General Packet Radio Service (GPRS) ..................................................... 33 4.2.1 Introduction................................................................................................ 33 4.2.2 APN resolution in PDP Context activation ................................................. 33 4.2.3 Inter-SGSN handovers for active PDP Contexts ........................................ 35 4.3 Multi-media Messaging Service (MMS) ..................................................... 36 4.3.1 Introduction................................................................................................ 36 4.3.2 MM delivery based on MSISDN for the Direct Interconnect model ............. 37 4.3.3 MM delivery based on MSISDN for the Indirect Interconnect model .......... 38 4.3.4 MM delivery based on NAI/e-mail address................................................. 39 4.4 WLAN Inter-working .................................................................................. 39 4.4.1 Introduction................................................................................................ 39 4.5 IP Multi-media core network Sub-system (IMS) ......................................... 40 4.5.1 Introduction................................................................................................ 40 4.5.2 SIP server configuration ............................................................................ 41 4.5.3 Domain Names used ................................................................................. 43 4.6 Generic Authentication Architecture (GAA) ................................................ 43 4.6.1 Introduction................................................................................................ 43 4.7 Generic Access Network (GAN) ................................................................ 43 V6.0 Page 2 of 78 GSM Association Non Confidential Official Document IR.67 4.7.1 Introduction................................................................................................ 43 4.8 Secure User Plane Location (SUPL).......................................................... 44 4.8.1 Introduction................................................................................................ 44 4.9 Enhanced Packet Core (EPC) ................................................................... 44 4.9.1 Introduction................................................................................................ 44 4.10 IMS Centralised Services (ICS) ................................................................. 44 4.10.1 Introduction................................................................................................ 44 4.11 Access Network Discovery Support Function (ANDSF) ............................. 44 4.11.1 Introduction................................................................................................ 44 4.12 Mobile Broadcast Services (BCAST) ......................................................... 44 4.12.1 Introduction................................................................................................ 44 4.13 The XCAP Root URI on Ut Interface for MMTEL/IMS profile for Voice and SMS (XCAP) 45 4.13.1 Introduction................................................................................................ 45 5 E.164 Number Translation ............................................................................. 45 5.1 Introduction................................................................................................ 45 5.2 General Requirements .............................................................................. 46 5.3 Architecture ............................................................................................... 47 5.3.1 Introduction................................................................................................ 47 5.3.2 Data Delegation Structure ......................................................................... 47 5.3.3 Resolution procedure ................................................................................ 49 5.3.4 Access to ENUM servers and Interconnection policy ................................. 50 5.3.5 Number Portability considerations ............................................................. 51 5.4 Technical Requirements ............................................................................ 51 5.4.1 Introduction................................................................................................ 51 5.4.2 ENUM Query ............................................................................................. 51 5.4.3 ENUM Response ....................................................................................... 52 6 Processes and Procedures relating to DNS ................................................. 55 6.1 Introduction................................................................................................ 55 6.2 Existing domains/sub-domains on the GRX/IPX network and their Allocation55 6.3 Procedures relating to new domain names on the GRX/IPX network......... 56 7 Annex A: Sample BIND DNS Configuration for GPRS ................................. 56 7.1 Introduction................................................................................................ 56 7.2 The "named.conf" file ................................................................................ 57 7.2.1 The "named.conf" file for a PLMN