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draft-ietf-sip-dnss-00.txt
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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 <to be defined
by IANA>.
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 <to be defined by IANA>.
Domain names in the <to be defined> domain are defined to have
up to six labels in addition to the <to be defined> 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
<SIP-ADDR.ARPA> 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]