Codes & Standards - Subscribe

CAN/CSA-ISO/IEC 21991-04 (R2017)

Information Technology - Telecommunications and Information Exchange Between Systems - Corporate Telecommunication Networks - Signalling Interworking Between QSIG and H.323 - Call Completion Supplementary Services (Adopted ISO/IEC 21991:2002, first edition, 2002-06-15)

SKU: 2701911 Published by CSA Group Publication Year 2004 Reaffirmed in 2017

Scope

This International Standard specifies signalling interworking between QSIG and H.323 in support of call completion supplementary services within a Corporate telecommunication Network (CN).

QSIG is a signalling protocol that operates at the Q reference point between Private Integrated services Network eXchanges (PINX) within a Private Integrated Services Network (PISN). The Q reference point is defined in ISO/IEC 11579-1. A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other Standards, in particular ISO/IEC 11572 (call control in support of basic services), ISO/IEC 11582 (generic functional protocol for the support of supplementary services) and a number of standards specifying individual supplementary services. ISO/IEC 13870 specifies the QSIG protocol in support of call completion services.

H.323 is a set of signalling protocols for the support of voice or multimedia communication within a packet network, in particular a packet network that uses the Internet Protocol (IP) as its network layer protocol (IP network). H.323 signalling protocols operate between endpoints in an IP network, either indirectly via one or more gatekeepers, or directly. An endpoint can be a terminal or a gateway to another network. H.323 is an umbrella recommendation referring to various ITU-T recommendations, in particular Recommendations H.225.0 and H.245 (basic communication capabilities) and Recommendation H.450.1 (generic functional protocol for the support of supplementary services). Recommendation H.450.9 specifies the H.323 protocol in support of call completion services.

NOTE - H.450.9 applies only to the 1998 version of H.323 (also known as H.323 version 2) and to later versions.

In both ISO/IEC 13870 (QSIG) and ITU-Recommendation H.450.9 (H.323), the call completion supplementary services are Completion of Calls to Busy Subscribers (SS-CCBS) and Completion of Calls on No Reply (SS-CCNR). These supplementary services apply after a call establishment attempt has failed because the called user was busy or not available, and provide means to re-establish the call when the called user becomes available.

Interworking between QSIG and H.323 permits a call originating at a user of a PISN to terminate at a user of a private IP network, or a call originating at a user of a private IP network to terminate at a user of a PISN. In such a scenario, this International Standard allows the completion of calls when the called user becomes available after having been busy (SSCCBS), or having not answered the original call (SS-CCNR).

Interworking between a PISN employing QSIG and a public IP network employing H.323 is outside the scope of this International Standard. However, the functionality specified in this International Standard is in principle applicable to such a scenario when deployed in conjunction with other relevant functionality (e.g., number translation, security functions, etc.).

This International Standard is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a private IP network employing H.323.

Download a list of included items

Request Copyright Permissions

Annual subscription keeps you up-to-date with the latest editions of standards and includes all supported languages and archive versions.

* Price is for up to 10 users. Select the number of users required on the cart page. Subscription must include a minimum of 10 standards or a collection to proceed to checkout.

Includes annual access to:

• Newest and previous editions in PDF format
• Revisions, updates and amendments
• All supported languages

Learn More

FORMAT

PDF

LANGUAGE

English, French

Buy

$121.00 CAD

Go to additional format options

GST REG No R119441681
QST REG No R1006017360

Features	CSA Advantage^TM	CSA OnDemand^TM
Offline access
Full-text search
Create highlights and personal notes
Newest editions added automatically
Includes all supported languages and archive versions
My Files - create customized files by adding multiple clauses, tables or figures from the standard into your own personal File for quick reference
Toggle between your files and the full standard to maintain context
Instantly preview cross referenced material within the book
Export personal notes to Excel
Transfer notes and highlights when updates are available
Adobe Reader PDF and browser compatible for iOS and Android
Web, Android, iOS Compatible

Browse By Subject Area

Browse By Publisher

ICS Catalogue

Browse By Subject Area

CSA Subscriptions

ICS Catalogue

en

fr

Catalogue

Browse By Subject Area

Browse By Publisher

ICS Catalogue

Subscription

Browse By Subject Area

CSA Subscriptions

ICS Catalogue

Services

en

fr

Codes & Standards - Subscribe

CAN/CSA-ISO/IEC 21991-04 (R2017)

Product Details

CAN/CSA-ISO/IEC 21991-04 (R2017)

Information Technology - Telecommunications and Information Exchange Between Systems - Corporate Telecommunication Networks - Signalling Interworking Between QSIG and H.323 - Call Completion Supplementary Services (Adopted ISO/IEC 21991:2002, first edition, 2002-06-15)

Browse By Subject Area

Browse By Publisher

ICS Catalogue

Browse By Subject Area

CSA Subscriptions

ICS Catalogue

Language

en

fr

Currency

CAD

USD

Catalogue

Browse By Subject Area

Browse By Publisher

ICS Catalogue

Subscription

Browse By Subject Area

CSA Subscriptions

ICS Catalogue

Services

Language

en

fr

Currency

CAD

USD

Search Section

Codes & Standards - Subscribe

CAN/CSA-ISO/IEC 21991-04 (R2017)

Product Details

CAN/CSA-ISO/IEC 21991-04 (R2017)

Information Technology - Telecommunications and Information Exchange Between Systems - Corporate Telecommunication Networks - Signalling Interworking Between QSIG and H.323 - Call Completion Supplementary Services (Adopted ISO/IEC 21991:2002, first edition, 2002-06-15)