JPH057246A - Camp-on service communication system - Google Patents

Abstract

PURPOSE:To provide a camp-on service between subscribers stored in a different exchange not having a direct voice line concerning a signal system between plural exchanging stations in a communication network having a common channel signaling function. CONSTITUTION:In a transmitting side exchange 10 and a receiving side exchange 20 connected by a common channel signal network 30, service control parts 15 and 25 to control a camp-on service and service condition holding memories 17 and 27 to hold the service condition of the camp-on are provided at call control parts 13 and 23, service monitoring control parts 16 and 26 to monitor the camp-on service and subscriber monitoring condition holding memories 18 and 28 to hold the condition concerning the subscriber monitoring are provided at subscriber service parts 14 and 24, a call control signal and a service control signal are extracted from a digital signal transmitted and received by common channel signal control parts 11 and 21, the camp-on service is controlled, the camp-on service between subscribers is monitored and the service condition is held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camp-on service communication system between a plurality of exchanges in a communication network having a No. 7 common line signaling system function. The common line signaling system is a signaling system of a telephone switching network for transmitting a call control signal through a common line between each switching center and a common line signaling network when constructing a transmission line between the switching centers.

FIG. 5 shows a system configuration example of a communication network having a common line signaling function. In the figure, 1 is a telephone switching network, 2 is a common line signaling network, 3, 4, 5 are local exchanges,
Reference numerals 6 and 7 represent transit exchanges, and reference numerals 8, 9, 9'indicate terminals A, B and C. The solid line indicates the transmission line, and the dotted line indicates the common line. When the user A makes a call, the terminal A activates the local exchange 1,
The common line signaling network 2 connects the transmission line to the transit exchange 6, the relay switching system 6 connects the transmission line to the relay exchange 7 by the common line signaling network 2, and the trunk line switching system 7 connects the local exchange by the common line signaling network. 4 is connected, the local exchange 4 is activated to connect to the terminal B, and the user B responds to the call and the telephone call state is established. When the call ends, the connected transmission line is released under the control of the common line signaling network. Similarly, when the user A calls the user C, the transmission line is connected by the call control of the common line signaling network.

In the common line signaling type telephone exchange network, a protocol class to which the common line signaling type SCCP (Advanced Telephone Service User Part) is applied is used to control a plurality of exchanges. By using the function of the common line signaling system, various services which have not been provided by the conventional telephone network have come to be provided. One of them is the camp-on service (callback service). The service that interrupts the telephone between the calling subscribers in case of an emergency and makes a call with the required terminal has been performed only with the PBX or the leased line. Although it has not been known, it has become necessary to provide these camp-on services for subscriber calls between multiple exchanges.

[0004]

2. Description of the Related Art A conventional camp-on service is provided by a telephone network composed of a single exchange such as PBX.
In the conventional camp-on service, when the user A of the terminal A accommodated in the telephone network encounters the busy state of the terminal B trying to communicate with the terminal B also accommodated in the telephone network, the user A You can request camp-on service. User A can make a service request by performing a hooking operation while listening to the busy tone. The exchange monitors terminal B based on the original call information. When the terminal B ends the call, the exchange places the terminal B in the hold state and causes the user A to hear the ringing tone. Here, if the user A goes off-hook, the exchange sets up a call from the terminal A to the terminal B. Since the exchange can always know the states of the terminals A and B accommodated by itself, the camp-on service can be easily realized. However, it is impossible in the prior art to provide a camp-on service between terminals accommodated in different exchanges that do not have a direct line in a telephone network configured by using a plurality of exchanges.

[0005]

Conventionally, it has been impossible to provide a camp-on service between subscribers on a communication network composed of a plurality of exchanges, but it is accommodated in a different exchange that does not have a direct voice line. It is becoming necessary to provide camp-on services among registered subscribers.

The present invention applies the common line signaling SCCP, sets end-to-end communication between exchanges, and defines the type and sequence of signals exchanged between stations for each service, thereby The purpose is to provide advanced services such as camp-on service between terminals accommodated in different exchanges in the network.

[0007]

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 10 is an originating exchange which accommodates camp-on service registered subscribers, 20 is an terminating exchange which accommodates camp-on monitored subscribers, and 1
1 and 21 are common line signal control units for common line signal level 1 to 3, 12 and 22 are SCCP signals (level 3 and 5) SCCP
Signal control units, 13 and 23 are call control units that control calls, 14 and 24 are subscriber control units that control subscriber lines, and 15 and 25 are service controls that control the camp-on service added to the call control units. 16 and 26 are service monitoring and control units for monitoring the camp-on service added to the subscriber control unit, 17, 27 are service state holding memories for holding camp-on service states, and 18 and 28 are related to subscriber monitoring. A subscriber monitoring state holding memory for holding a state, 30 is a common line signaling network.

The common line signal control units 11 and 21 are common line signal networks.
Service control unit 1 connected by 30 and added with a dotted line
5, 25, service monitoring control units 16 and 26, service state holding memories 17 and 27, and subscriber monitoring state holding memories 18 and 28
Is a part added to the exchange for the camp-on service of the present invention.

The common line signaling system has a call control signal (ISUP) and a service control signal (SCCP).
, Which specifies the call control between users and specifies various advanced services. The present invention extracts the call control signal and the service control signal from the digital signals transmitted and received by the common line signal control units 11 and 21, controls the camp-on service, and monitors the camp-on service between subscribers to maintain the service state. To configure.

[0010]

2 and 3 are flowcharts showing the processing of the camp-on service of the present invention. The figure shows the subscriber action of the originating exchange 10 and the subscriber action of the terminating exchange 20,
7 shows a processing flow in the case where a common line signal is transmitted and received by a common line signal network 30 between the originating exchange 10 and the terminating exchange 20. (1) When the camp-on service registered subscriber A dials off-hook, normal call processing is performed in the originating exchange 10 and the calling signal IAM (ISUP) is transmitted to the destination exchange.
It is sent to 20, but subscriber B is busy because it is busy. (2) The destination exchange 20 displays in the signal the reason why the connection cannot be established. If the connection cannot be established because the called subscriber B is busy, the signal point number of the own station is set and the call controller 23 is set. Functions are added. Disconnection signal REL to the originating exchange 10
(ISUP) is sent, and the busy tone is sent to the subscriber A by normal call processing. (3) When the subscriber switching unit 10 detects hooking due to the hooking of the subscriber A, the call control unit 13 checks whether the subscriber can camp on. This is to check whether the use of the service is permitted / has the destination signal point number. If it is determined that the subscriber is a service subscriber, a service audible tone is sent to subscriber A. (4) When the subscriber A hears the service audible sound and dials the service special number, the calling side exchange 10 captures the memory 17 required for the camp-on service. Since the number of this resource becomes the "call identification number" of the calling station in this service, an SCCP signal is created and transmitted. The destination is identified by the signal point number in the disconnection signal REL.
The service registration request signal CRRQ (SCCP) is sent to the destination exchange 20 to capture the memory 28 necessary for the destination exchange 20 to perform the camp-on service, and for the subscriber B, the monitor controller 26 and the memory 27. To start the end-call monitoring. (5) Monitoring start notification signal SUS (S
CCP), the originating exchange 10 sends a service reception sound to the subscriber A, and the subscriber hears this sound and goes on-hook. (6) When the subscriber B is on-hook, the terminating exchange 20 performs a normal call release process for a call between the monitored subscriber B and the third party C by the call control unit 23 and the subscriber control unit 24. .. Considering that the subscriber tries to make a call immediately after disconnecting, the service control unit
Timing at 25. If the subscriber B does not use the terminal, the supervisory control unit is provided for the service of the subscriber B.
26 and the memory 27 are put on hold. A monitoring start notification signal SUST (SCCP) is sent to the originating exchange 10, and the originating exchange 10 calls the subscriber A by the service monitoring controller 16 and the service controller 15. Subscriber A hears the ringing tone. (7) When the subscriber A goes off-hook, the originating exchange 10
Sets a new call based on the information in the service state holding memory 17, and sends a ringing tone to the subscriber A. A calling signal IAM (ISUP) is sent to the destination exchange 20, and the call control unit 23 and the service control unit 25 in the destination exchange 20.
If the calling subscriber number is a service registrant, subscriber B is called. Subscriber B hears the ringing tone. (8) Response signal A if subscriber B responds off-hook
NM (ISUP) is sent to the originating exchange 10 and the subscribers A and B are in a call state. The ISU at this time
The P sequence used was between analog terminals. (9) When the call state is reached, the originating exchange 10 has completed the service, so the resources for the camp-on service are released,
Service termination notification signal CCLI to the destination exchange 20
(SCCP) is sent and the service is completed in the destination exchange 20, so the resources for the camp-on service are released. (10) Then perform normal call processing.

[0011]

EXAMPLE An example of a camp-on service will be described with reference to FIG. 5 showing a system configuration example of a communication network having the above-mentioned common line signaling function. The description shows the case of the camp-on normal pattern, and shows the case where the camp-on registered subscriber A sets a re-call to the terminal B that is in a call with the terminal C on another exchange.

A local exchange 4 constituting the communication network 1.
And the terminal B accommodated in the local exchange 5 respectively
And terminal C is in a call, at this time, terminal A makes a call and requests the common line signaling network 2 to set up a call with terminal B. This call captures a line from the local exchange 3 to the local exchange 4 via the transit exchange 6, the transit exchange 7, and the terminal B
User B to hear the ringing tone. However, since the terminal B is in a busy state, the local exchange 4 notifies the local exchange 3 of the reason for the call setup failure and the reason thereof. Upon receiving this notification, the local exchange 3 tries to give the busy tone to the user A of the terminal A. At that time, if the service type of the user A is checked and the user is a camp-on service registrant, the information of the original call is not discarded and is saved only for a certain timing. User A can request camp-on service from the network if desired when listening to the busy tone. The procedure may be, for example, in the case of a telephone, hooking and dialing a service special number. When the local exchange 3 receives the service request of the user A while the original call is stored, the local exchange 3 performs inter-exchange end-to-exchange communication with the local exchange 4 based on the information and makes a camp-on registration request. The local exchange 4 starts monitoring the terminal B in response to the camp-on registration request from the local exchange 3. This monitoring does not necessarily have to be dynamic on its own, but may be performed in accordance with the transition of the existing call state. When the local exchange 4 can start monitoring the terminal B normally, the local exchange 3 notifies the local exchange 3 of the fact by a monitoring start notification signal. Then, the local exchange 3 makes the user A hear the service reception sound. User A
Check the reception sound and go on-hook. With this, the camp-on monitoring state is set.

When the communication between the terminals B and C is completed and the call between them is released, the local exchange 4 sends a re-call request to the local exchange 3. Further, at this time, the local exchange 4 can regulate outgoing calls, incoming calls, or both during a certain timing when the terminal B is put on hold. The local exchange 3 which has received the re-call request sends a ringing tone to the terminal A to notify the user A that the service is available. This ringing tone is sent out at a certain timing, and the user A can request the service start by going off-hook. Then, the local exchange 3 sets up a recall based on the stored original call. When the terminal B receives the setting of the recalling, the terminal B may be connected by the existing call processing. However, when the incoming call to the terminal B is put on hold, it is necessary to check whether the caller ID of the re-call matches the registrant ID of the service (that is, the user A). When the local exchange 4 makes a call to the terminal B and the user B answers, the local exchange 3 knows that the recalling is in the talking state. At this time, the local exchange 3 sends a service cancellation notice to the local exchange 4 to end the camp-on service at the originating station. When the local exchange 4 receives the service release notification, it terminates similarly.

A sequence diagram of the embodiment of the present invention is shown in FIG. FIG. 4A shows a normal camp-on pattern, and FIG.
4B is a registrant busy pattern at camp-on recall request, FIG. 4C is a registrant busy pattern at camp-on recall setting, and FIG. 4D is a registrant monitoring timeout pattern. FIG. 4E shows a pattern in which registered person monitoring cannot be set.

In the case of the normal camp-on pattern of FIG. 4A, the call setup fails because the called subscriber B is busy, and the calling subscriber A hears BT (busy tone) and joins. According to the service registration request procedure of the person A, a service registration request signal is sent from the calling station to the called station, and a monitoring start notification signal is sent back from the called station to the calling station. When the subscriber B who is talking with the subscriber C finishes talking, a call back request is sent from the receiving station to the calling station, and the recalling is set between the calling station and the called station, and the subscriber A joins. Person B can talk. At the same time, a service release notification is sent from the calling station to the called station, the service is released, and the normal call processing state is restored.

In the case of the registrant busy pattern at the time of camp-on recall request of FIG. 4 (b), FIG. )
However, if the subscriber A is busy at that time, a service continuation notification is sent from the originating station to the destination station and the connection to the subscriber B is suspended, and when the subscriber A terminates the call. Recall is set, and thereafter, the same sequence as in FIG. 4A is performed.

In the case of the registrant busy pattern at camp-on recall setting in FIG. 4 (c), in FIG. 4 (b),
If subscriber A's busy is terminated and the service continuation notification is sent to the destination station, or if subscriber B is busy and the call setup fails, the originating station will continue to the destination station. When the service continuation notification is sent out and the subscriber B ends the call, a call back request is sent from the called station to the calling station, and the call setting is performed. After that, the same sequence as in FIG.

In the case of the registered person monitoring time-out pattern shown in FIG. 4D, the monitoring start notification is issued from the destination station in response to the service registration request from the originating station, and the subscriber B ends the call for a certain timing. If the subscriber B does not end the call with the subscriber C and times out after waiting, a service release notification is sent from the called station to the calling station, the service is released, and the subscriber A ends the call.

In the case of the unregistered person monitoring setting impossible pattern of FIG. 4E, when the service registration request cannot be made at the destination station when the service registration request is made from the source station to the destination station,
The termination notification is transmitted from the destination station to the originating station without transmitting the monitoring start notification, and the call ends.

[0020]

By using the common line signaling system (SCCP),
By defining the signal type between multiple exchanges and probing the sequence procedure, it becomes possible to provide camp-on service between terminals accommodated in different exchanges. The services that could only be provided to subscribers accommodated in the are now available to the entire communication network. Also, it can be combined with other services.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a processing flowchart (1) of the present invention.

FIG. 3 is a processing flowchart (2) of the present invention.

FIG. 4 is a sequence diagram of an embodiment.

[Fig. 5] System configuration example of communication network

[Explanation of symbols]

 1 Telephone switching network 2, 30 Common line signaling network 3, 4, 5 Local switching system 6, 7 Transit switching system 8, 9, 9'Terminal 10 Originating side switching system 20 Destination switching system 11, 21 Common line signaling controller 12, 22 SCCP Signal control unit 13, 23 Call control unit 14, 24 Subscriber control unit 15, 25 Service control unit 16, 26 Service monitoring control unit 17, 27 Service status holding memory 18, 28 Subscriber monitoring status holding memory

Claims (1)

Claims: 1. A calling exchange (10) for accommodating a camp-on service registered subscriber in a signaling system between a plurality of exchanges in a communication network having a common line signaling system function, Camping-on exchanges that accommodate monitored subscribers (20)
In addition, a common line signal control unit (11, 21) for connecting and controlling the common line signal network (30), an SCCP signal control unit (12, 22) for controlling SCCP signals (service information), and call information are controlled. It has a call control unit (13, 23) and a subscriber control unit (14, 24) for controlling a subscriber line, and the call control unit (13, 23) has a service control unit for controlling a camp-on service ( 15, 2
5) and a service status holding memory (17, 27) for holding the camp-on service status, and a service monitoring control section (16, 26) for monitoring the camp-on service in the subscriber control section (14, 24). ) And a subscriber monitoring status holding memory (18, 28) for holding status related to subscriber monitoring, and a call control signal (ISUP) and service control signal (SCCP) part in the common line signaling system signal format. It has a call control signal and a service control signal from digital signals transmitted and received by the common line signal control units 11 and 21, controls the camp-on service, and monitors the camp-on service between subscribers to maintain the service state. A camp-on-service communication method characterized by: