Network Working Group C. Huitema Internet Draft INRIA Expiration Date: September 1993 March 1993 SIP addresses in the domain name service Specifications C. Huitema Christian.Huitema@sophia.inria.fr 1. Status of this Memo This document is an Internet Draft. Internet Drafts are working documents of the Internet Engineering Task Force (IETF), its Areas, and its Working Groups. Note that other groups may also distribute working documents as Internet Drafts. Internet Drafts are draft documents valid for a maximum of six months. Internet Drafts may be updated, replaced, or obsoleted by other documents at any time. It is not appropriate to use Internet Drafts as reference material or to cite them other than as a "working draft" or "work in progress." Please check the I-D abstract listing contained in each Internet Draft directory to learn the current status of this or any other Internet Draft. This document defines the conventions for storing 64 bits SIP addresses and the corresponding reverse records in the domain name service. This document is an output of the SIP working group. It defines a complement to the RFC-1035, "DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION". Distribution of this memo is unlimited. Questions should be directed to the editor. Internet draft SIP and DNS 2. Overview In order to store the addresses of SIP systems in the domain name service, a new record format of type AA is created. The information part of this record shall contain a 64 bits SIP address. In order to allow easy retrieval of the domain names of SIP systems, a special naming domain is defined. 3. The AA Type value The TYPE value associated to the AA record is . 4. The AA RDATA format ____________________________ | ADDRESS | |___________________________| where ADDRESS is a 64 bits SIP address, in "network byte order". Hosts that have multiple SIP addresses will have multiple AA records. 5. The inverse domain The inverse domain used to support gateway location and SIP address to domain name mapping is . Domain names in the domain are defined to have up to six labels in addition to the suffix. The two most significant tokens represent each two octets of the SIP address expressed as a character string for an hexadecimal value in the range 0-FFFF (with leading zeros omitted except in the case of a null value which is represented by a single zero). The last four tokens each represent one octet of a SIP address, expressed as a character string for an decimal value in the range 0-FF (with leading zeros omitted except in the case of a zero octet which is represented by a single zero). Four example, the name corresponding to the SIP address: C. Huitema [Page 2] Internet draft SIP and DNS 0abc:f120:138.96.24.84 can be obtained through the inverse domain name: 84.24.96.138.f120.abc.sip-addr.arpa 6. Provisional conventions Pending allocation of a record type by IANA, the value 64 is used for type AA. Pending allocation of an inverse domain by IANA, the value is used. These values shall only be used during the early tests inside the SIP WG. This section will be removed before final publication of this document. C. Huitema [Page 3]