Telephonic communications – Special services – Service trigger
Patent
1997-09-03
2000-04-25
Hong, Harry S.
Telephonic communications
Special services
Service trigger
379209, 379219, 379230, 379901, H04M 342, H04M 348, H04M 700
Patent
active
060553030
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the implementation of certain telecommunications services, more particular to a telecommunications system in which such services can be implemented, a method of implementing such services and a transit node for use in the implementation of such services.
2. Description of Related Art
A CCBS (Completion of Calls to Busy Subscriber) service is one example of a subscriber service which uses end-to-end signalling, and in which the service is implemented by operations performed in both a calling subscriber and called subscriber local exchange. Implementation of a CCBS service requires that the calling party's local exchange has knowledge of the called party's subscriber access code, as used in the called party's local exchange.
GVNS (Global Virtual NetworkService) modifies the routing code transmitted by a calling party during transmission, with the result that there is no transparency through the network for the called party's access code, as used in the called party's local exchange.
There is a clear need for the provision of CCBS over GVNS, yet the two service systems appear, at first sight, to be incompatible. Various solutions can be offered for this problem. However, if a solution is to be workable it must take into account the various standards which apply to GVNS and CCBS, and produce a minimum disturbance to these standards.
The present invention provides a solution to the problem of providing CCBS services over GVNS. It should be noted that the present invention has application to interworking between: subscribers in which: remote exchange, is required in a calling subscriber local exchange; subscriber routing code, used by said calling subscriber local exchange; and
The present invention overcomes the problems associated with providing CCBS over GVNS by providing a relay CCBS applications service element, (CCBS-ASE), in a GVNS transit node, and arranging for end-to-end signalling to be replaced by two TC dialogues, one between the calling party's LE and the relay CCBS-ASE and the other between the called party's LE and the relay CCBS-ASE. Of course, if more than one routing code translation occurs, because the signalling is routed via several GVNS transit nodes, a multi-stage chain of TC dialogues may be necessary.
With GVNS, as at present defined, there is nothing to prevent a terminating local exchange sending a CCBS indicator in the backward release message, since that exchange cannot distinguish between a normal call and a GVNS call. The transit nodes, in which the GVNS routing function is performed, lack the ability to delete the CCBS indicator. Thus, the CCBS indicator is repeated all the way back to the originating exchange. The originating exchange is not aware that the call is a GVNS call. Thus, a CCBS request from the calling user will result in a CCBS request being sent, with the called party's number used as a global title, towards the SCCP in the node with the originating GVNS routing function (or towards the node with the GVNS access function). In this node, the SCCP cannot deliver the CCBS request towards a CCBS-ASE, because, the node does not have a CCBS-ASE. Neither can the CCBS request be delivered towards the node where the CCBS-ASE, for the terminating user, is located, because the called party number is not known. The routing number has been translated by the GVNS routing function into the access number for the called party's LE. The CCBS request will fail because of the message return procedure. If no solution is found to this problem, all GVNS calls, for which CCBS is requested, will lead to unnecessary signalling procedures which activate the message return procedure. The problem created by interaction between CCBS and GVNS will not be solved by simply omitting CCBS for GVNS calls. The CCBS request must either be prevented, or some means provided for handling it.
Signal linking is known as such, for example, where translation between the signalling protocols used in different networks is re
REFERENCES:
patent: 5119415 (1992-06-01), Aoyama
patent: 5282244 (1994-01-01), Fuller et al.
patent: 5838782 (1998-11-01), Lindquist
Hong Harry S.
Telia AB
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