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Closed User Groups for All

IP.com Disclosure Number: IPCOM000021148D
Published in the IP.com Journal: Volume 4 Issue 1 (2004-01-25)
Included in the Prior Art Database: 2004-Jan-25
Document File: 1 page(s) / 42K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In networks used for communication is a service called CUG (Closed User Group). This service enables a group of users to communicate with each other, but prevents communication to or from other packet switching customers. CUG members can be ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network) subscribers. The ISDN technologies are managed by legacy TDM (Time Division Multiplex) Local Exchange switches. The standardised interface used for connecting a Local Exchange with an access network is in this case the V5.x interface. On the other side, the NGN technologies (Next Generation Network) integrate the IP-end-devices via an open interface (e.g. H.323, SIP). The problem is that the NGN subscribers can not be handled by a TDM switch as member of a CUG and the TDM subscribers can not be handled by a NGN switch as CUG members. The solution of this problem can be provided by the creation of an access list ("CUG for all"-list) containing subscribers of different types who belong to the same CUG. Each CUG user is administrated by the "CUG for all"-list with the respective CUG identity (ID). The "CUG for all"-list will contain E164 numbers of subscribers. E164 is the technical specification of IETF (Internet Engineering Task Force) describing how to convert a telephone number into internet domain name. The E164 numbers can be accessed by the CUG ID, together with all possible outgoing/incoming call baring information for each user. In that way a CUG member can access subscribers that may not support CUG feature at all because they are pure IP-subscribers.

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Closed User Groups for All

Idea: Ilias Karalis, GR-Athens

In networks used for communication is a service called CUG (Closed User Group). This service enables a group of users to communicate with each other, but prevents communication to or from other packet switching customers. CUG members can be ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network) subscribers. The ISDN technologies are managed by legacy TDM (Time Division Multiplex) Local Exchange switches. The standardised interface used for connecting a Local Exchange with an access network is in this case the V5.x interface. On the other side, the NGN technologies (Next Generation Network) integrate the IP-end-devices via an open interface (e.g. H.323, SIP). The problem is that the NGN subscribers can not be handled by a TDM switch as member of a CUG and the TDM subscribers can not be handled by a NGN switch as CUG members.

The solution of this problem can be provided by the creation of an access list ("CUG for all"-list) containing subscribers of different types who belong to the same CUG. Each CUG user is administrated by the "CUG for all"-list with the respective CUG identity (ID). The "CUG for all"-list will contain E164 numbers of subscribers. E164 is the technical specification of IETF (Internet Engineering Task Force) describing how to convert a telephone number into internet domain name. The E164 numbers can be access...