JP2002077265A - Method and sysem for detouring communication line at occurrence of line fault - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detour a system to another communication channel and public line, when the quality of communication line is deteriorated in the communication channel of an IP network, which is being selected at present. SOLUTION: The calling side of IP trunk circuits 5 and 6 detects quality deterioration of the communication line of the communication channel in a first line connection route in the selected IP network 2. The selection suppressing timer of the calling side of the exchanges 3 and 4 counts prescribed time, when quality deterioration is considered to be restored. The calling side of controllers 23 and 24 controls the calling side of the exchanges 3 and 4 and the IP trunk circuits 5 and 6, and controls to select another communication channel of a second connection route from the communication channel of the first connection route and to detour it. It also controls the calling side of the exchanges 3 and 4 and the IP trunk circuits 5 and 6, performs control for restoring the system to the communication channel of the first connection route from the other communication channel of the second connection route, and resumes communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an IP (Internet).
When the quality of a communication line on a (Protocol) network is degraded or in a congested state, a line fallback in an IP trunk for bypassing to another communication channel in ISDN or a public line such as ISDN or PSTN (Public Switched Telephone Network) is processed. And a system for bypassing a communication line when a line failure occurs.

[0002]

2. Description of the Related Art Conventionally, for example, in a telephone service using an IP network using B-ISDN, a transmission delay time in packet transmission is increased due to an increase in traffic volume (overload), and the demand for real-time communication is met. Can not. Furthermore, if the voice frame of a telephone call changes and the voice frame is discarded by controlling the change absorption, the call may be interrupted or noise may be mixed in the call.

In order to cope with this problem, the telephone service provided by the IP network is stopped in a time zone where the telephone call volume is large, and the existing public telephone service (ISDN or PSTN) is used. For this reason, a proposal has been made to grasp the state of a telephone call over an IP network and automatically switch to an existing public telephone service.

[0004] As an example of this proposal, there is an example in which, when the throughput (processing amount) in a data network (Internet) exceeds a threshold value, switching to an existing public telephone network (ISDN or PSTN) is performed to perform line connection. (For example, JP-A-11-225206 "Apparatus and method for establishing call connection").

Further, when it is recognized that the state of the Internet / intranet telephone call is overloaded, the VoIP (VoIP) dedicated to the IP call in the private branch exchange of the private telephone network.
There is an example in which a trunk circuit is artificially set to a busy state, and the trunk circuit is forcibly switched to an existing public telephone network (for example, JP-A-11-308345, "Network and Private Network").

A VoIP trunk circuit of an exchange for processing outgoing / incoming calls (outgoing / incoming) through such an IP network,
It has a function to measure the quality deterioration of the communication line and a function to notify the exchange side of the difficulty of the call, that is, a function to notify the quality deterioration of the communication line.These functions are used for measuring the traffic volume. I have.

[0007]

As described above, in the conventional example, when the quality of a communication line is degraded, the calling exchange automatically switches from the IP network based on the quality deterioration data of the communication line. Only the switching setting for bypassing to the line connection route of the public line network is performed, and for example, there is a disadvantage that the line connection route cannot be bypassed in a congested state.

[0008] Further, the line connection route in the IP network is not known for both the calling side exchange and the called side exchange.
That is, since the IP line connection route can recognize only one line connection route, the VoIP trunk circuit may
When the quality deterioration of the communication line of the network is detected, this VoIP
Even if the exchange side directly notifies the exchange side of the deterioration of the communication line from the trunk circuit, the exchange side regards all of the line connection routes connected to the IP network as the deterioration of the communication line and performs the detour by the public line network. There was a drawback that they would be selected uniquely.

The present invention solves such problems in the prior art. When the quality of a communication line in an IP network is degraded or in a congested state, another communication channel in the ISDN, an ISDN or PSTN, or the like is used. It is an object of the present invention to provide a communication line detouring method in the event of a line failure and a system thereof, which can be detoured to a public network so that the communication failure can be quickly and reliably avoided.

[0010]

In order to achieve the above object, a method for bypassing a communication line when a line failure occurs according to the present invention comprises:
The switching process of the IP network is controlled by the common channel method,
Processing a line fallback by an IP trunk between the switching processing and the IP network processing, wherein the IP trunk selects a communication channel of a first circuit connection route in the IP network; Detecting the degradation of the quality of the communication line of the connection route, and executing the switching process and the IP trunk process under the control of the common channel system when the quality degradation of the communication line is detected.
A step of selecting another communication channel of the second circuit connection route from the communication channel of the circuit connection route to bypass the communication channel; a step of counting a predetermined time period in which the quality deterioration of the communication line is considered to be recovered; After the completion of the above, returning from another communication channel of the second circuit connection route to the communication channel of the first circuit connection route.

According to the method of the present invention, the switching process of the IP network and the public network is controlled by a common channel system,
Processing the line fallback by the IP trunk between the P network processing, wherein the IP trunk selects a communication channel of the first circuit connection route in the IP network; Detecting the quality deterioration of the communication line, and, when detecting the quality deterioration of the communication line, executing the switching process and the IP trunk process under the control of the common channel system, and performing the switching from the communication channel of the first line connection route to the second channel. Detouring to the public network of the line connection route, counting a predetermined period of time in which it is considered that the quality deterioration of the communication line has been recovered, and, after completion of the predetermined period, switching from the public network of the second line connection route to the first network. Returning to the communication channel of the line connection route.

According to the method of the present invention, the switching process of the IP network is controlled by the common channel method, and the line fallback by the IP trunk between the switching process and the IP network process is processed. A step of selecting a communication channel of a first circuit connection route in the IP network; a step of detecting a congestion state of the first circuit connection route in control of the common channel method; The switching process and the IP trunk process are executed under the control, and the communication channel of the first line connection route
A step of selecting and bypassing another communication channel of the circuit connection route; a step of counting a predetermined time period for which the congestion state is considered to have been recovered; and another communication method of the second circuit connection route after the completion of the predetermined time period. Returning to the communication channel of the first line connection route from the channel.

According to the method of the present invention, the switching process of the IP network and the public network is controlled by a common channel system,
A line fallback by an IP trunk between the P network processing is performed. The IP trunk selects a communication channel of a first line connection route in the IP network. A step of detecting a congestion state in the connection route; and, when the congestion state is detected, the exchange processing and the I
Executing a P trunk process to detour from the communication channel of the first circuit connection route to the public network of the second circuit connection route, and counting a predetermined time period for which it is considered that the quality deterioration of the communication circuit has recovered. Returning to the communication channel of the first circuit connection route from the public network of the second circuit connection route after the end of the predetermined time.

In the communication line bypass system according to the present invention, an IP network exchange is provided with timing means, is controlled by a common line type control device, and is connected to an IP trunk circuit connected between the exchange and the IP network. And the IP trunk circuit selects a communication channel of a first line connection route in the IP network, and
The quality deterioration of the communication line of the first line connection route is detected, the time counting means counts a predetermined period of time in which the quality deterioration of the communication line is considered to have recovered, and the control device transmits the communication line from the IP trunk circuit to the communication line. In accordance with the quality deterioration notification, the switching unit and the IP trunk circuit are controlled to perform control of selecting and bypassing another communication channel of the second circuit connection route from the communication channel of the first circuit connection route, and After a certain period of time, the switch and the IP trunk circuit are controlled to execute control for returning from another communication channel of the second circuit connection route to the communication channel of the first circuit connection route.

In the system according to the present invention, an exchange connected to an IP network and a public network is provided with a clocking means, is controlled by a control device of a common channel system, and is connected between the exchange and the IP network. The IP trunk circuit, which processes line fallback by the IP trunk circuit,
A communication channel of the first line connection route in the network is selected, and the quality deterioration of the communication line of the first line connection route is detected, and the time measuring means determines that the quality deterioration of the communication line has been recovered for a predetermined period of time. And the control device
Based on the notification of the quality deterioration of the communication line from the IP trunk circuit, the switch and the IP trunk circuit are controlled to select and bypass the public network of the second circuit connection route from the communication channel of the first circuit connection route, In addition, after a certain period of time in the timekeeping means, control is performed to control the exchange and the IP trunk circuit to return from the public network of the second circuit connection route to the communication channel of the first circuit connection route.

According to the system of the present invention, an IP network exchange is provided with timekeeping means, is controlled by a common channel type control device, and has a line fall by an IP trunk circuit connected between the exchange and the IP network. The IP trunk circuit selects a communication channel of the first circuit connection route in the IP network, detects the congestion state of the first circuit connection route, and the timekeeping means recovers the congestion state. The control device controls the exchange and the IP trunk circuit by the congestion state notification from the IP trunk circuit, and controls the exchange and the IP trunk circuit from the communication channel of the first circuit connection route to the second circuit connection route. Execute control to select and bypass other communication channels, and
After a certain period of time in the timing means, the exchange and the IP
The configuration is such that control is performed to control the trunk circuit to return from another communication channel of the second circuit connection route to the communication channel of the first circuit connection route.

In the system according to the present invention, an exchange connected to an IP network and a public network is provided with a timing unit, is controlled by a common line type control device, and is connected between the exchange and the IP network. A line fallback process is performed by an IP trunk circuit.
A communication channel for a first circuit connection route in the network, a congestion state of the first circuit connection route detected, and a timer counts a predetermined period of time in which the congestion state is considered to be recovered; Controls the exchange and the IP trunk circuit by the notification of the congestion state from the IP trunk circuit, and
A control for selecting and bypassing the public network of the line connection route is executed, and after a certain period of time is ended by the timing means, controlling the exchange and the IP trunk circuit to connect the first line connection from the public network of the second line connection route. It is configured to execute control for returning to the root communication channel.

According to the present invention, when the quality of the communication line is deteriorated or the congestion state occurs in the communication channel of the selected IP network, another communication channel in the ISDN or the ISDN is used.
Alternatively, it is possible to automatically detour to a public network such as PSTN, for example. As a result, the communication failure can be avoided quickly and reliably (early), and the communication can be continued.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for bypassing a communication line when a line failure occurs and a system thereof according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. Referring to FIG. 1, the first embodiment has an IP network 2, and exchanges 3 and 4 are connected to the IP network 2. The exchange 3 is accommodated in the IP network 2 through a VoIP trunk circuit 10. The exchange 4 is accommodated in the IP network 2 through a VoIP trunk circuit 11 that measures the quality deterioration of the communication line for each call and notifies the CA (Call Agen / control unit 24 described later) of the quality.

Further, the exchange 3 has an IP telephone device 14 having a terminal (for example, a personal computer) connected to a handset (for example, a microphone and an earphone) and having software for telephone connection and processing by the IP network 2 installed. The IP telephone device 16 is connected to the exchange 4 in the same manner.

The exchanges 3 and 4 are connected to control devices 23 and 24 for executing exchange control between stations (exchanges), for example, using a 0.7 common line system.

The control units 23 and 24 are generally provided with a monitoring processing unit, a signal transmission / reception unit, and a switch (switch circuit of the exchanges 3 and 4) control unit (not shown).

Note that a subscriber circuit is provided between the IP telephone device 14 and the exchange 3, but is not shown here. Similarly, a subscriber circuit between the IP telephone device 16 and the exchange 4 is not shown.

Next, the operation of the first embodiment will be described. Hereinafter, the operation of the telephone call through the IP network 2 will be described. The operation of data communication through the terminals (for example, small general-purpose computer / personal computer) of the IP telephone devices 14 and 16 is the same as the following operation.

First, the operation of each device of the first embodiment will be described with reference to FIG. The VoIP trunk circuits 10 and 11 process connections with the IP network 2 respectively, measure the quality deterioration of the communication line for each call, and notify the respective CAs (control devices 23 and 24).

The CA is used for the VoIP trunk circuits 10 and 11.
The quality degradation of the communication line corresponding to the final destination received is counted, and the value of the quality degradation of the communication line is monitored.If this value exceeds the threshold value, the disconnection reason data is output for each call. Set the value of the quality degradation of the communication line,
A process for notifying the exchange (3 or 4) on the calling side is executed. The final destination corresponds to the area identification number and the area code (for example, 03 or 06) in the telephone number plan. The count of the quality deterioration of the communication line is, for example, error detection by a cyclic redundancy check (CRC) method.

The exchanges 3 and 4 are provided with CAs (control devices 23 and 2).
Based on the disconnection reason data from 4), a telephone call is made for a certain period of time by a detour connection route through a communication channel (logical channel such as TDMA system).

Next, the overall operation of the first embodiment will be described with reference to FIG. Hereinafter, the exchange 3 is referred to as a calling side, the exchange 4 is referred to as a called side, and the IP telephone device 14 connected to the exchange 3 is referred to as a calling side terminal.
The IP telephone device 16 connected to the exchange 4 will be described as a called terminal.

(A) The VoIP trunk circuit 10 measures the value of the quality deterioration of the communication line for each call from the calling terminal, and notifies the control device 23 of the measured value. (B) The control device 23 transmits an IVT (Internet VoIP (Voice
over Internet Protocol) Trunk) Examine the quality deterioration of the communication line of the IP network corresponding to the final destination.

(C) When the value of the quality deterioration of the communication line exceeds a predetermined threshold value, the calling exchange 3
A hunt restriction request signal is transmitted to the P network 2. (D) Upon receiving the hunt restriction request signal, the exchange 3 sets another communication channel for a certain period of time and bypasses the line connection route. (E) In this case, the caller's exchange 3 is diverted only to the last destination line where the quality of the communication line in the IP network 2 is deteriorated.

Next, the operation of the first embodiment will be described in detail. FIG. 2 is a sequence diagram illustrating a procedure of the operation of the first embodiment. Referring to FIG. 1 and FIG. 2, when a call (SETUP) from a subscriber (calling terminal) is made, the calling exchange 3 switches a plurality of VoIP trunk circuits 10 from a first line connection route (for example, TDMA). VoIP trunk circuit corresponding to the communication channel (e.g., system). The VoIP trunk circuit 10 is connected to the control device 23 (C
A), a head address message (hereinafter referred to as IAM) is transmitted.

The Vo corresponding to the first line connection route
A configuration may be adopted in which the interface processing of communication line switching setting (communication channel selection) in one VoIP trunk circuit is executed without selecting the IP trunk circuit.

Under the control of the control device 23 (CA), a first line connection route in the IP network 2 is designated and connected to the exchange 4 on the called side. The exchange 4 on the called side makes a call (SETUP) to the called terminal, and the called terminal responds (CALL PROC).

The access control data module (ACM) is transferred from the exchange 4 on the called side to the exchange 3 on the calling side. Thereafter, the call ends. After this call ends,
The VoIP trunk circuit 10 transfers the quality degradation value (communication line quality notification) of the communication line of the first line connection route selected this time to the control device 23 (CA). Then, the disconnection signal (RE) from the called terminal through the exchange 4 on the called side.
L) is transferred to the exchange 3 on the calling side.

The control unit 23 (CA) receives and monitors the value of the quality deterioration of the communication line from the VoIP trunk circuit 10 for each call, and determines the value corresponding to the above-mentioned final destination. The control device 23
(CA) is compared with a threshold value set in advance, and it is determined whether or not the count value is exceeded in this comparison.

Thereafter, a call originating request to the calling exchange 3 from the calling terminal to the final destination exceeding the threshold (SETU).
When P) is received, the calling exchange 3 sends a head address message (IAM) to the control device 23. Further, the calling exchange 3 responds to the calling terminal (CA).
LL PROC). At this point, the calling exchange 3 activates a first line connection route (communication channel) selection suppression timer (time measuring means in the claims).

Then, the calling exchange 3 does not issue a connection request to the last designated destination exceeding the threshold value, but sets a value of the quality deterioration of the communication line in the disconnection reason data and sets a disconnection signal (REL). ) Is returned to the calling exchange 3 (hunt control request). The exchange 3 on the calling side has the control device 23 (C
The head address message (IAM) is transmitted to the called exchange 4 through A). The exchange 4 on the called side makes a call (SETUP) to the called side terminal, and the called side terminal responds (CALL PROC).

The exchange 4 on the called side transfers an access control data module (ACM) to the exchange 3 on the calling side. Hereinafter, a general call connection procedure is performed, and the telephone call is executed. Even during this general call connection procedure, the selection suppression timer in the calling exchange 3 is running.

Thereafter, a call originating request to the calling exchange 3 from the calling terminal to the final destination exceeding the threshold value (SETU).
When P) is received, the calling exchange 3 receives a disconnection signal (REL) in which a value of the quality deterioration of the communication line is set according to the disconnection reason data. In other words, the selection suppression timer for the line connection route to the IP network 2 for the final destination is being activated. During the activation of the selection suppression timer in the calling exchange 3, the selection of the first line connection route is not executed until the halt is stopped.

That is, a VoIP trunk circuit corresponding to the second circuit connection route is selected from a plurality of VoIP trunk circuits, and a head address message (IAM) is transmitted to the exchange 4 on the called side through the controller 23 (CA). I do. The second line connection route is a communication channel different from the communication channel of the first line connection route in the TDMA system or the like. The exchange 4 on the called side makes a call (SETUP) to the called terminal, and the called terminal responds (CAL).
L PROC).

The exchange 4 on the called side transfers an access control data module (ACM) to the exchange 3 on the calling side. The calling exchange 3 responds to the called terminal (CA).
LLPROC). Hereinafter, a general call connection procedure is performed, and the telephone call is executed. Even during this general call connection procedure, the selection suppression timer in the calling exchange 3 is running.

Then, the call according to the general call connection procedure is completed, and the calling terminal makes a call (SETUP). At this point, the selection suppression timer of the calling exchange 3 stops counting. As a result, the selection (use) of the first line connection route is resumed, assuming that there is no quality deterioration of the communication line of the first line connection route. This resumed first
A telephone call is executed by a general call connection procedure through a line connection route.

The value of the selection suppression timer is an empirical value until the quality deterioration of the communication line of the first line connection route is eliminated and the quality deterioration of the communication line is recovered.

As described above, in the first embodiment, the IP
When a network is selected and the quality of the communication line is deteriorated, another communication channel is selected and automatically bypassed, so that telephone calls and data transfer are normally and continuously performed.

Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram showing a configuration according to the second embodiment of the present invention. Referring to FIG. 3, the second embodiment includes a PSTN network 1 and an IP network 2 shown in FIG.
Is provided.

The exchanges (exchange offices) 3 and 4 shown in FIG. 1 are connected to the PSTN network 1 and the IP network 2, respectively. The exchange 3 is accommodated in the PSTN network 1 through a trunk circuit 5, and the exchange 4
It is accommodated in the STN network 1. Further, the VoIP trunk circuits 10, 1 having the same configuration as the first embodiment of FIG.
1, fixed telephones 13 and 15, IP telephone devices 14 and 16,
Control devices 23 and 24 are provided.

The fixed telephone 13 and the IP telephone 1
A subscriber circuit is provided between the switch 4 and the exchange 3,
Here, the illustration is omitted. Similarly, fixed telephone 15
A subscriber circuit is provided between the IP telephone device 16 and the exchange 4, but is not shown.

Next, the operation of the second embodiment will be described. First, the operation of each device will be described with reference to FIG. VoIP trunk circuits 10 and 11, fixed telephones 13 and 15, and IP telephone device 1 having the same configuration as in FIG.
The operations of the control units 4 and 16 and the control units 23 and 24 are the same as those of the first embodiment described with reference to FIG.

The trunk circuits 5 and 6 having a configuration unique to the second embodiment process connection with the PSTN network 1 office line. The exchanges 3 and 4 are provided with CAs (control devices 23 and 2)
PST for a certain time based on the disconnection reason data from 4)
The call is switched to the detour connection route through the N network 1 and the telephone call is performed.

Next, the schematic operation of the second embodiment will be described with reference to FIG. Hereinafter, as in the first embodiment, the exchange 3 is called (calling), the exchange 4 is called (incoming), and the IP telephone device 14 connected to the exchange 3 is a calling terminal. Further, the IP telephone device 16 connected to the exchange 4 will be described as a called terminal.

In the second embodiment, the following (1) and (2) are executed as described in the first embodiment. (1) The VoIP trunk circuit 10 measures the quality deterioration of the communication line for each call. (2) When the value of the quality deterioration of the communication line exceeds a predetermined threshold value, a hunt restriction request signal is transmitted to the IP network 2 to the exchange 3 on the calling side. Next, the following (3) is executed according to the second embodiment. (3) Upon receiving the hunt restriction request signal, the exchange 3 switches to the PSTN 1 for a certain period of time to bypass the line connection route.

Next, in the operation of the second embodiment, the first
Only the operation of the main part different from the embodiment will be described. This second
The basic processing procedure of the embodiment is the same as the sequence of FIG. Referring to FIG. 2 and FIG. 3, the sequence from the calling of the calling terminal to the activation of the first line connection route selection suppression timer in FIG. 2 is the same as in the first embodiment. The first line connection route here is the IP network 2.
Furthermore, from the start of the selection suppression timer to its stop,
The sequence is the same as in the first embodiment.

While the selection suppression timer is counting,
Under the control of the control device 23, the calling exchange 3 selects the trunk circuit 6 corresponding to the second line connection route, and
A line connection is made through the network 1, the trunk circuit 6, and the exchange 4 on the called side. Then, an analog telephone sequence is executed between the fixed telephones 13 and 15 (from transmission of a call signal, transmission of a selection signal, closing of a communication path to recovery of a communication path upon termination of call), and the analog telephone call is performed.

The selection suppression timer of the exchange 3 on the calling side is
Stop counting. As a result, the selection (use) of the first line connection route is resumed, assuming that there is no quality deterioration of the communication line of the first line connection route. Through the restarted first line connection route, the IP telephone device 14,
A telephone call is made between 16.

As described above, in the second embodiment, the IP
When the network is selected and the quality of the communication line is deteriorated, the PSTN 1 is selected and automatically bypassed, so that telephone calls and data transfer are normally and continuously performed.

Next, a third embodiment will be described. The third embodiment will be described with reference to FIGS. 2 and 3. In FIG. 3, when the control devices 23 and 24 recognize the congestion state of their own device or the exchange (the exchange 3 or 4) of the other party, respectively, the own device side establishes the first line connection as in the first embodiment. A route (a communication channel in the TDMA system or the like) is switched to a second line connection route (another communication channel in the TDMA system or the like) and bypassed.

When the control devices 23 and 24 recognize the congestion state of their own device or the exchange (exchange 3 or 4) on the other end, respectively, the exchanges on the other end (exchange 3 or 4)
To notify the occurrence of congestion. Then, the exchange (exchange 3 or 4) on the partner side switches the first line connection route (communication channel in the TDMA system or the like) to the second line connection route (T
Switch to another communication channel in the DMA system or the like to bypass.

As described above, in the third embodiment, the IP
Since a network is selected and another communication channel is selected and automatically bypassed when the network is congested, telephone calls and data transfer are normally and continuously performed.

Next, a fourth embodiment will be described. In the above-described third embodiment, when the control devices 23 and 24 recognize the congestion state, the control devices 23 and 24 switch from the first line connection route to the communication channel of the second line connection route to bypass the route. Then, as described in the second embodiment, the PSTN 1 is selected and bypassed, and the analog telephone call is performed.

As described above, in the fourth embodiment, the IP
When a network is selected and the network is congested, the PSTN 1 is selected and automatically bypassed, so that telephone calls and data transfer can be normally and continuously performed.

In this embodiment, the first line connection route is automatically switched from the second line connection route. However, the switching may be performed by a manual operation, and this embodiment is also included in the present invention.

[0063]

As is apparent from the above description, according to the method and system for bypassing a communication line when a line failure occurs according to the present invention, the quality of the communication line in the communication channel of the selected IP network is degraded. In a time or congestion state, it is automatically or manually bypassed to another communication channel in ISDN or a public network such as ISDN or PSTN.

As a result, it is possible to avoid a communication failure quickly and reliably (early), and it is possible to continue the communication.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram illustrating a procedure of an operation of the embodiment.

FIG. 3 is a block diagram illustrating a configuration of a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PSTN network 2 IP network 3,4 Switch 5,6 Trunk circuit 10,11 VoIP trunk circuit 13,15 Fixed telephone 14,16 IP telephone device 23,24 Control device

Claims (8)

[Claims] An IP network exchange process is controlled by a common channel system, and an IP network between the exchange process and the IP network process is controlled.
A method of bypassing a communication line in the event of a line failure processing a line fallback by a trunk, wherein the IP trunk selects a communication channel of a first line connection route in an IP network; Detecting the quality degradation of the communication line of the route; and performing the switching process and the IP trunk process under the control of the common channel system when detecting the quality degradation of the communication line, thereby performing the communication channel of the first line connection route. Selecting another communication channel of the second circuit connection route from the network and bypassing the communication channel; counting a predetermined period of time in which it is considered that the quality deterioration of the communication line has recovered; Returning to the communication channel of the first circuit connection route from another communication channel of the circuit connection route. Characterized the door, the communication line bypassing method when a line failure occurs. 2. A communication line at the time of occurrence of a line failure, wherein switching processing of an IP network and a public network is controlled by a common line system, and processing of line fallback by an IP trunk between the switching processing and the IP network processing is performed. In the detour method, the IP trunk selects a communication channel of a first line connection route in an IP network; a step of detecting quality deterioration of a communication line of the first line connection route by IP trunk processing; Performing a switching process and an IP trunk process under the control of the common line system to detect a deterioration in the quality of the line and to detour from the communication channel of the first line connection route to the public network of the second line connection route; Counting a predetermined period of time for which the quality deterioration of the communication line is considered to have recovered; And having a step of returning from the public network connection route to the communication channel of the first line connection route, a communication line bypassing method when a line failure occurs. 3. An exchange process of an IP network is controlled by a common channel system, and an IP network between the exchange process and the IP network process is controlled.
A method of bypassing a communication line when a line failure occurs, which handles line fallback by a trunk, wherein the IP trunk selects a communication channel of a first line connection route in an IP network; Detecting the congestion state of the one-line connection route, and when detecting this congestion state, executes the switching process and the IP trunk process under the control of the common channel system, and executes the second and the fourth communication channels from the communication channel of the first line connection route. Selecting and bypassing another communication channel of the circuit connection route; counting a predetermined period of time in which the congestion state is considered to have recovered; Returning from the communication channel to the communication channel of the first circuit connection route. Communication line bypass method in the event of a failure. 4. A communication line at the time of occurrence of a line failure, wherein switching processing of an IP network and a public network is controlled by a common line system, and processing of line fallback by an IP trunk between the switching processing and the IP network processing is performed. The detour method, wherein the IP trunk selects a communication channel of a first circuit connection route in an IP network; and in the control of the common channel system, a step of detecting a congestion state in the first circuit connection route; When detecting the congestion state, performing a switching process and an IP trunk process under the control of the common channel system to detour from the communication channel of the first circuit connection route to the public network of the second circuit connection route; Counting a predetermined period of time in which the quality degradation of the communication line is considered to have recovered; Characterized that the communication line bypassing method when a line failure occurs in that it comprises the steps of returning the capital of the public network to the communication channel of the first line connection route, the. 5. An exchange in an IP network is provided with a clocking means, is controlled by a common line type control device, and processes line fallback by an IP trunk circuit connected between the exchange and the IP network. The IP trunk circuit selects a communication channel of a first line connection route in the IP network, detects quality deterioration of a communication line of the first line connection route, and detects the timing. Means for counting a predetermined period of time in which the deterioration of the quality of the communication line is considered to have recovered, and the control device controls the exchange and the IP trunk circuit based on the notification of the quality deterioration of the communication line from the IP trunk circuit. Performing control to select and bypass another communication channel of the second circuit connection route from the communication channel of the first circuit connection route, and After a certain period of time in the timer means is completed, control is performed to control the exchange and the IP trunk circuit to return from another communication channel of the second circuit connection route to the communication channel of the first circuit connection route. Characteristic communication line bypass system. 6. An exchange connected to an IP network and a public network is provided with a clocking means, is controlled by a common line type control device, and is an IP trunk circuit connected between the exchange and the IP network. Wherein the IP trunk circuit selects a communication channel of a first line connection route in the IP network, and the quality of the communication line of the first line connection route is degraded. The time counting means counts a predetermined period of time for which it is considered that the quality deterioration of the communication line has recovered, and the control device notifies the exchange and the switch by the communication line quality deterioration notification from the IP trunk circuit. Controlling the IP trunk circuit to select and bypass the public network of the second circuit connection route from the communication channel of the first circuit connection route; And after the fixed time in the timing means has been completed, executing control for controlling the exchange and the IP trunk circuit to return from the public network of the second circuit connection route to the communication channel of the first circuit connection route. A communication line detour system characterized by the above-mentioned. 7. An exchange in an IP network is provided with a clocking means and is controlled by a control device of a common channel system, and processes line fallback by an IP trunk circuit connected between the exchange and the IP network. The IP trunk circuit selects a communication channel of a first circuit connection route in the IP network, and detects a congestion state of the first circuit connection route; The control device counts a predetermined period of time for which the congestion state is considered to have recovered, and the control device controls the exchange and the IP trunk circuit according to a congestion state notification from the IP trunk circuit to control the first circuit connection route. A control for selecting another communication channel of the second circuit connection route from the communication channel and performing a detour is performed, and the time counting means terminates a predetermined time. Later, the the other communication channels of the second line connection route by controlling the switch and the IP trunk circuit 1
A communication line bypass system for performing control to return to a communication channel of a line connection route. 8. An exchange connected to an IP network and a public network is provided with a clock unit, is controlled by a common line type control device, and is connected to the IP trunk circuit between the exchange and the IP network. Wherein the IP trunk circuit selects a communication channel of a first line connection route in the IP network and detects a congestion state of the first line connection route. The time counting means counts a predetermined period of time that the congestion state is considered to have recovered, and the control device controls the exchange and the IP trunk circuit by a congestion state notification from the IP trunk circuit. A control is performed to select and bypass the public network of the second circuit connection route from the communication channel of the first circuit connection route, After the end of the between,
Controlling the exchange and the IP trunk circuit to execute a control of returning from the public network of the second circuit connection route to the communication channel of the first circuit connection route.