Telephonic communications – Special services – Service trigger
Patent
1998-09-24
2000-08-08
Smith, Creighton
Telephonic communications
Special services
Service trigger
379220, 379230, H04M 342
Patent
active
061012505
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method according to the preamble of the attached claim 1 for controlling a call attempt by employing an intelligent network.
BACKGROUND OF THE INVENTION
The fast development of telecommunications has made it possible for operators to provide users with a multitude of different services. A network architecture providing advanced services is referred to as an Intelligent Network, commonly abbreviated to IN. An intelligent network architecture may be applied to most telecommunication networks, such as the PSTN (Public Switched Telephone Network), PSPDN (Packet Switched Public Data Network, as well as ISDN and B-ISDN networks (Integrated Services Digital Network, Broadband ISDN). Independent of the network architecture, the purpose of intelligent network architecture is to facilitate the creation, control and management of new tele services. Present IN specifications include the Bellcore AIN Rel.1 (Advanced Intelligent Network, Release 1) and the ITU-T (formerly, CCITT) specification Capability Set 1 (CS-1).
The functional architecture of an intelligent network is illustrated by FIG. 1, in which the functional entities of the network are presented as ovals. In the following, a brief discussion will be offered of this architecture in order to make the method according to the invention easier to understand.
The end user's (subscriber's) access to the network is handled by a CCAF function (Call Control Agent Function). Access to IN services is implemented by making amendments to the existing digital exchanges. This is carried out by utilizing a BCSM (Basic Call State Model) which describes the existing functionality by which a call between two users is processed. The BCSM is a high-layer state automaton description of the CCF functions (Call Control Function) required for setting up and maintaining an inter-user connection route. By means of an SSF function (Service Switching Function), functionality is incorporated into this state model (cf. the partly overlapping elements CCF and SSF in FIG. 1), to be able to decide when services of the intelligent network (i.e. IN services) must be invoked. When these IN services have been invoked, a Service Control Function (SCF) containing the service logic of the intelligent network takes care of the service-specific handling (of a call attempt). The SSF, then, couples the CCF (Call Control Function) to the SCF (Service Control Function) and allows it to control the CCF. The SCF may e.g. request the SSF/CCF to carry out particular call or connection functions, for example charging or routing operations. The SCF may also send requests to an SDF (Service Data Function) which handles access to service-specific information and network information of the intelligent network. Thus, the SCF may e.g. request the SDF to retrieve information on a specific service or to update such information. The SDF conceals the actual implementation of the information from the SCF and offers the SCF a logical view of the information.
The operations described above are further complemented by an SRF (Specialized Resources Function), which provides specialized measures required to carry out some services offered by the intelligent network. These include protocol changes, speech recognition, voice announcements, etc. The SCF may e.g. request the SSF/CCF functions to first establish a connection between the end users and the SRF, and then request the SRF to give voice messages to the end users.
Other functional entities of the intelligent network are various kinds of management-related operations, such as SCEF (Service Creation Environment Function), SMF (Service Management Function), and SMAF (Service Management Access Function). The SMF comprises e.g. the management of services, the SMAF provides an interface to the SMF, and the SCEF enables defining, development, testing and inputting to the SMF of the IN services. As these functions are only related to the operation of the network operator, they are not shown in FIG. 1.
In the following
REFERENCES:
patent: 5701412 (1997-12-01), Takeda et al.
patent: 5878128 (1999-03-01), Kantola
Advanced Intelligent Network, Release 1 Network and Operations Plan, Jun. 1990, SR-NPL-001623.
Distributed Functional Plane for Intelligent Network CS-1, ITU-T, Q. 1214, Oct. 1995.
Intelligent Network (IN): Intelligent Network Capability Set 1 (CS1), Core Intelligent Network Application Protocol (INAP) Part 1: Protocol specification, ETS 300 374-1, Jul. 1994.
Specifications of Signalling System No. 7, Introduction to CCITT Signalling System No. 7, ITU-T Recommendation Q.700, Mar. 1993.
Nokia Telecommunications Oy
Smith Creighton
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