1. Field of the Invention
The present invention relates to an intelligent peripheral system and a call processing method thereof, and in particular to an improved IP(Intelligent Peripheral) system and a call processing method thereof which are capable of directly being connected with another IP system and implementing an easier expandability of a resource channel by separately connecting an apparatus processing a protocol matching function between a user and an IP network and an apparatus processing a call processing function.
2. Description of the Conventional Art
The IP(Intelligent Peripheral) system is directed to an independent intelligent network system which is capable of providing a user who requests an advanced intelligent network service through a SSP(Service Switching Point) with a special resource such as a guide broadcasting, a DTMF(Dual Tone Multi-Frequency) gathering, an audio recording, an audio mixing, an audio recognition, a FAX transmission/receiving function, etc. In particular, an IP(Intelligent Peripheral) system which is connected with another advanced intelligent network element through a NO. 7 signaling network in the IP system is called as a network IP(Network Intelligent Peripheral) system.
FIG. 1 is a view illustrating an advanced intelligent network including the above-described IP. In the advanced intelligent network, a SCP(Service Control Point) 10, a SSP(Service Switching Point) 20 and an IP system 30 are connected with a common line signal network 50 through a plurality of STPs(Signaling Transfer Point) 51. At this time, the IP 30 connects a bearer channel 40 and a SSP 20 based on an E1 trunk and communicates a signal message with the SCP 10 and the SSP 20 through a signaling link 60 connected with the STP 51.
The IP 30 is formed of a resource sub-system which performs a call processing operation by allocating a resource to a bearer channel using an ISUP(ISDN user Part) and an INAP(Intelligent Network Application Protocol) which are connected in a common line signal network platform.
FIG. 2 illustrates a procedure that an advanced intelligent network system provides a user with an intelligent network service. As shown therein, when a user transmits a request message for an intelligent network service in Step S201, the SCP 10 recognizes the intelligent network service request and allows the SSP 20 to connect the bearer channel with the IP 30 for providing a user with a special resource in accordance with a service logic in Step S202. The SSP 20 transmits an IAM(Initial Address Message) which set a called party address as an address of the IP 30 for connecting the bearer channel. At this time, the IAM is transferred through a signaling route of the common line signal network. The IP 30 which receives the IAM transmits an ACM(Address Complete Message) to the SSP 20 in accordance with an ISUP call processing procedure in Step 204 and requests a special resource to the SCP 10 for the user.
The SCP 10 received the request from the IP 30 drives the special resource in the IP 30 in accordance with the service logic, and the IP 30 transmits an AM(Answer Message) in accordance with an ISUP call processing procedure in Step S207 and drives the special resource for therein implementing an interface with the user based on the special resource in Step S208. In addition, a result of the special resource is informed to the SCP 10. At this time, the SCP 10 may continuously instructs a special resource driving and releases a bearer channel between the SSP 20 and the IP 30. If the bearer channel between the SSP 20 and the IP 30 is released, it is performed based on the ISUP call processing procedure.
Namely, when a channel release request signal is transmitted from the SCP 10 to the SSP 20 in Step S210, the SSP 20 received the signal transmits a REL(Release) message to the IP 30 for releasing the bearer channel, and the IP 30 transmits a RLC(Release Complete) message in Step S212.
When the IP is formed of an independent network, the call processing is performed based on the ISUP and INAP signal processing method. In the conventional exchange, the call is processed based on the R2 or ISUP signal method. An output repeater bearer channel is obtained by interpreting the called number of the input repeater bearer channel and IAM based on a number interpretation function of the exchange for thereby switching the bearer channel.
In the case of the conventional IP system formed of the resource sub-systems, if it is needed to expand the channel capacity of the special resource, the capacity of the resource sub-system should be expanded. In this case, since there is a limit in the capacity of the system for expanding the resource sub-system, other IP systems formed of the resource system should be added to the common line signal network. Therefore, the common line signal network platform is build for every IP system which is to be build for thereby increasing the fabrication cost of the system.
Accordingly, it is an object of the present invention to provide an intelligent peripheral system and a call processing method thereof which overcome the aforementioned problems encountered in the conventional art.
It is another object of the present invention to provide an intelligent peripheral system and a call processing method thereof which are capable of directly being connected with another IP system and implementing an easier expandability of a resource channel by separately connecting an apparatus processing a protocol matching function between a user and an IP network and an apparatus processing a call processing function.
In order to achieve the above objects, there is provided an intelligent peripheral system which includes an apparatus storing and maintaining a special resource information for providing an intelligent network system to a user in accordance with a request of the user, and an apparatus performing a protocol matching function and a call processing function between a service switching point(SSP) and a service control point(SCP) of the advanced intelligent network system, wherein said both apparatuses are separately installed for thereby implementing a direct connection to another intelligent network system through a common line signal network and easily expanding a resource channel.
In order to achieve the above objects, there is provided a call processing method of an intelligent peripheral system which includes the steps of a first step in which the SSP receives a request message for an intelligent network service from a user and transmits an initial address message(IAM) to the resource exchange sub-system for a bearer channel connection between the SSP and the IP providing system, a second step in which the resource exchange sub-system which received the IAM checks the capacity of the resource sub-system to provide a user with a special resource, a third step for transmitting an address receiving completed message(ACM) to the SSP and then requesting a special resource to the SCP when the resource sub-system is available as a result of the check of the second step, a fourth step for selecting an available special channel among the special resource channels connected between the resource exchange sub-system and the resource sub-system in accordance with a special resource requested, requesting a connection to the time switch of the resource exchange sub-system for connecting the selected special resource channel and the bearer channel and transmitting an answer message(ANM) to the SSP, a fifth step in which the resource exchange sub-system drives the special resource of the resource sub-system connected by the special channel for receiving a special resource from the resource sub-system and transmits a result of the special resource providing operation to the SCP, and a sixth step for maintaining a communication state so that a special resource is transmitted to the user through a special channel set between the resource sub-system and the resource exchange sub-system and a bearer channel set between the resource exchange sub-system and the service exchange.
Additional advantages, objects and other features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly leveled out in the appended claims as a result of the experiment compared to the conventional arts.