ISO IEC 21992 pdf download – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Mapping functions for the tunnelling of QSIG through IP networks

ISO IEC 21992 pdf download – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Mapping functions for the tunnelling of QSIG through IP networks
1 Scope
This International Standard specifies functions for using a packet network that uses the Intemet Protocol (IP)as its network layer protocol and UDP and TCP as its transport layer protocols, to interconnect two PrivateIntegrated services Network eXchanges (PINXs) forming part of a Private Integrated Services Network (PISN).Interconnection is achieved by carrying the inter-PINX signalling protocol directly over the TransmissionControl Protocol (TCP) and inter-PINX user information (e.g., voice) over the Real-time Transport Protocol(RTP)，RTP being carried over the User Datagram Protocol (UDP). The inter-PINX signalling protocol isassumed to be QsIG, as specified in ISo/IEC 11572, ISO/IEC 11582 and other International Standards.
This International Standard provides for two types of interconnection:
on-demand， where a separate TCP connection for QsIlG is established at the start of each call andcleared down at the end of that call; and
semi-permanent，where a single TCP connection with an indefinite lifetime carries QsIG on behalf ofmany single calls.
This International Standard is applicable to PINXs that can be interconnected to form a PISN using QsIG asthe inter-PINX signalling protocol.
2 Conformance
ln order to conform to this International Standard，a PINX shall satisfy the requirements identified in thelmplementation Conformance Statement (ICS) proforma in Annex A.
3 Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences,only the edition cited applies.For undated references, the latest edition of the referenceddocument (including any amendmentsy applies.
ISOIEC 11572:2000，Information technology — Telecommunications and information exchange betweensystems — Private Integrated Services Network — Circuit mode bearer services — Inter-exchange signallingprocedures and protocol
ISO/EC 11574;2000，Information technology — Telecommunications and information exchange betweensystems — Private Integrated Services Network – Circuit-mode 64 kbit/s bearer services – Servicedescription, functional capabilities and information fiows
ISOIEC 11579-1:1994,Information technology —Telecommunications and information exchange betweensystems —Private integrated services network — Part 1:Reference configuration for PISN Exchanges(PINX)
ISOIEC11582:2002，Information technology —Telecommunications and information exchange betweensystems — Private Integrated Services Network – Generic functional protocol for thesupport ofsupplementary services — Inter-exchange signalling procedures and protocol
ITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs
ITU-T Rec. I.210:1993, Principles of telecommunication services supported by an ISDN and the means to
describe them
IETF RFC 760, Internet Protocol
IETF RFC 761, Transmission Control Protocol
IETF RFC 768, User Datagram Protocol
IETF RFC 1889, RTP: A Transport Protocol for Real-Time Applications
IETF RFC 2126, ISO Transport Service on top of TCP (ITOT)
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1 External definitions
This International Standard uses the following terms defined in other documents:
 IVN (ISO/IEC 11579-1)
 PINX (ISO/IEC 11579-1)
 PISN (ISO/IEC 11579-1)
 Service (ITU-T Rec. I.112)
 Signalling (ITU-T Rec. I.112)
4.2 Other definitions
4.2.1
Calling PINX
In the context of a call or call-independent signalling connection across an IPL, the PINX that transmits the
QSIG SETUP message.
4.2.2
Called PINX
In the context of a call or call-independent signalling connection across an IPL, the PINX that receives the
QSIG SETUP message.
4.2.3
Channel
A means of bi-directional transmission of user or signalling information between two points.
4.2.3.1
D Q -Channel
A channel used to convey call control information between the Q reference points of two peer PINXs.
4.2.3.2
U Q -Channel
A channel used to convey user information between the Q reference points of two peer PINXs.
4.2.4
Resource Control Information
Information exchanged between peer PINXs for the purpose of establishing UDP streams.
4.2.5
Inter-PINX Connection (IPC)
A connection provided by an IVN between two C reference points used to transport inter-PINX information from the PISN control plane and/or the PISN user plane.
4.2.6
QPKT
A packet format defined within this International Standard for conveying QSIG message and RCI (Resource Control Information).
5 List of acronyms
IP Internet Protocol
IPC Inter-PINX connection
IPL Inter-PINX Link
IVN InterVening Network
PINX Private Integrated services Network eXchange
PISN Private Integrated Services Network
QSIG Signalling information flows at the Q reference point
RCI Resource Control Information
RTCP Realtime Transport Control Protocol
RTP Realtime Transport Protocol
TCP Transmission Control Protocol
UDP User Datagram Protocol
6 Introduction
6.1 Reference configuration
ISO/IEC 11579-1 defines a reference configuration for a PINX. Logically the switching and call control functions of a PINX communicate over an instance of the Q reference point with a peer PINX. This communication is known as an Inter-PINX Link (IPL) and comprises a signalling channel, known as a D Q channel, and one or more user information channels, each known as a U Q -channel; see Figure 1. One or more IPLs can be established between the same pair of PINXs.