Network Working Group R. Mukundan
Request for Comments: 4129 Wipro Technologies
Category: Standards Track K. Morneault
Cisco Systems
N. Mangalpally
Nortel Networks
August 2005
Digital Private Network Signaling System (DPNSS)/
Digital Access Signaling System 2 (DASS 2)
Extensions to the IUA Protocol
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.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document defines a mechanism for backhauling Digital Private
Network Signaling System 1 (DPNSS 1) and Digital Access Signaling
System 2 (DASS 2) messages over IP by extending the ISDN User
Adaptation (IUA) Layer Protocol defined in RFC 3057. DPNSS 1,
specified in ND1301:2001/03 (formerly BTNR 188), is used to
interconnect Private Branch Exchanges (PBX) in a private network.
DASS 2, specified in BTNR 190, is used to connect PBXs to the PSTN.
This document aims to become an Appendix to IUA and to be the base
for a DPNSS 1/DASS 2 User Adaptation (DUA) implementation.
Mukundan, et al. Standards Track [Page 1]
RFC 4129 DPNSS/DASS 2 Extensions to the IUA Protocol August 2005
Table of Contents
1. Introduction ................................................. 2
1.1. Scope .................................................. 2
1.2. Terminology ............................................ 3
1.3. DPNSS Overview ......................................... 4
1.4. Proposed DPNSS Backhaul Architecture ................... 5
2. Changes from IUA ............................................. 5
2.1. New Message Class for DUA .............................. 5
2.2. Message Header ......................................... 6
2.3. Unit Data Message ...................................... 7
2.4. DLC Status Message ..................................... 7
2.5. Management (MGMT) Messages ............................. 9
3. IANA Considerations .......................................... 10
4. Use of SCTP Payload Protocol ID .............................. 10
5. Message Sequence in DUA ...................................... 11
5.1. Resetting of single DLC ................................ 11
5.2. Resetting all DLCs in a Link ........................... 11
5.3. Information Transfer on a DLC .......................... 12
5.4. Link Takedown (Single DLC) ............................. 12
5.5. Link Takedown (All DLCs) ............................... 12
5.6. Getting Link Status .................................... 12
5.7. Error Conditions ....................................... 12
6. Security Considerations ...................................... 13
7. References ................................................... 13
7.1. Normative References ................................... 13
8. Acknowledgements ............................................. 13
1. Introduction
This document describes a method of implementing Digital Private
Network Signaling System 1 (DPNSS 1) [2] (henceforth referred to as
just DPNSS) and Digital Access Signaling System 2 (DASS 2)[3]
backhaul messaging over IP using a modified version of the ISDN User
Adaptation Protocol (IUAP) [1]. The DPNSS/DASS 2 User Adaptation
(DUA) builds on top of IUA by defining the necessary extensions to
IUA for a DPNSS/DASS2 implementation.
1.1. Scope
There is a need for Switched Circuit Network (SCN) signaling protocol
delivery from a DPNSS Signaling Gateway (SG) to a Media Gateway
Controller (MGC). The delivery mechanism should support the
following protocols:
- DPNSS (Digital Private Network Signaling System) [2]
- DASS 2 (Digital Access Signaling System Number 2) [3]
Mukundan, et al. Standards Track [Page 2]
RFC 4129 DPNSS/DASS 2 Extensions to the IUA Protocol August 2005
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