Network Working Group M. Tuexen
Request for Comments: 5133 Muenster Univ. of Applied Sciences
Updates: 4233 K. Morneault
Category: Standards Track Cisco Systems, Inc.
December 2007
Terminal Endpoint Identifier (TEI) Query Request Number Change
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Abstract
The Integrated Services Digital Network (ISDN) Q.921-User Adaptation
Layer (IUA) Protocol, described in RFC 4233, defines the message type
of Terminal Endpoint Identifier (TEI) Query Request messages as 5.
However, this number is already being used by the Digital Private
Network Signaling System (DPNSS)/Digital Access Signaling System 2
(DASS 2) Extensions (DUA) to the IUA Protocol described in RFC 4129.
This document updates RFC 4233 such that the message type of TEI
Query Request messages is 8.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . . 2
3. New Message Type of the TEI Query Message . . . . . . . . . . . 2
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 2
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 2
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 2
7. Normative References . . . . . . . . . . . . . . . . . . . . . 3
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RFC 5133 TEI Query Request Number Change December 2007
1. Introduction
The Integrated Services Digital Network (ISDN) Q.921-User Adaptation
Layer (IUA) protocol, described in [RFC3057], does not define a
Terminal Endpoint Identifier (TEI) Query Request message. The
Digital Private Network Signaling System (DPNSS)/Digital Access
Signaling System 2 (DASS 2) Extensions (DUA) to the IUA Protocol,
described in [RFC4129], introduces Data Link Connection (DLC) Status
messages of type 5, 6, and 7. Then, [RFC4233] was published, which
updates [RFC3057]. [RFC4233] also introduces the TEI Query Request
message and uses the message type of 5 for it. This makes it
impossible to differentiate the DLC Status request from a TEI Query
Request.
This document updates [RFC4233].
2. Conventions Used in This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. New Message Type of the TEI Query Message
This document updates [RFC4233] by introducing the following change:
Terminal Endpoint Identifier (TEI) Query messages MUST be encoded
with a message type of 8 instead of 5 as described in [RFC4233].
4. IANA Considerations
In the "Message Types" section of the "Signaling User Adaptation
Layer Assignments" registry, IANA has reserved the message type 8 of
Management Messages for Terminal Endpoint Identifier (TEI) Query
Request messages.
5. Security Considerations
This document does not require any security considerations in
addition to the ones given in [RFC4233].
6. Acknowledgments
The authors wish to thank Jon Peterson and Christian Vogt for their
invaluable comments.
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RFC 5133 TEI Query Request Number Change December 2007
7. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3057] Morneault, K., Rengasami, S., Kalla, M., and G.
Sidebottom, "ISDN Q.921-User Adaptation Layer", RFC 3057,
February 2001.
[RFC4129] Mukundan, R., Morneault, K., and N. Mangalpally, "Digital
Private Network Signaling System (DPNSS)/Digital Access
Signaling System 2 (DASS 2) Extensions to the IUA
Protocol", RFC 4129, September 2005.
[RFC4233] Morneault, K., Rengasami, S., Kalla, M., and G.
Sidebottom, "Integrated Services Digital Network (ISDN)
Q.921-User Adaptation Layer", RFC 4233, January 2006.
Authors' Addresses
Michael Tuexen
Muenster Univ. of Applied Sciences
Stegerwaldstr. 39
48565 Steinfurt
Germany
EMail: tuexen@fh-muenster.de
Ken Morneault
Cisco Systems, Inc.
13615 Dulles Technology Drive
Herndon, VA 20171
US
Phone: +1-703-484-3323
EMail: kmorneau@cisco.com
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RFC 5133 TEI Query Request Number Change December 2007
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