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.
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.
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.
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.
[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.
Michael Tuexen Muenster Univ. of Applied Sciences Stegerwaldstr. 39 48565 Steinfurt Germany
Ken Morneault Cisco Systems, Inc. 13615 Dulles Technology Drive Herndon, VA 20171 US
Phone: +1-703-484-3323 EMail: firstname.lastname@example.org
Tuexen & Morneault Standards Track [Page 3]
RFC 5133 TEI Query Request Number Change December 2007
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