RU2111625C1 - Remote control telemetry call system - Google Patents

Abstract

FIELD: telecommunications. SUBSTANCE: system provides access to external service through telemetry call from user side output equipment, for example, alarm signal transmitter, information about state of unit of equipment. Operations and functions of user does not affect call. Such user functions as call wait are suppressed during telemetry call and resume their operations when it is terminated. In addition access from user side equipment to external service is provided through telephone line without restriction of user choice of telephone functions and equipment. EFFECT: increased functional capabilities. 29 cl, 3 dwg

Description

 The invention relates to telemetry systems using telecommunication networks, and more particularly, to devices for starting telemetry communication from remote locations of such a system.

 Currently, there are many areas of practical application in which the equipment of subscriber packages of the end user of the telemetric system initiates and sends a call to remote telemetry long-distance communications to some centralized service bureau. Such devices are used, for example, to transmit meter readings, message energy and information about use in household electrical and radio devices, as well as various alarms, including about fire and theft, directly from home to a service bureau or directly to the police or fire department. In such systems, after detecting an alarm indication, a call is automatically generated and sent to the service bureau, and some identification of the caller is transmitted through communication to the service bureau. The service bureau responds by sending a police or fire brigade to the place where the signal came from. Telemetric calls can also be initiated remotely for cases in which the measuring system begins to transmit messages about the results or failures that have occurred. In the present description, calls initiated by the equipment of the subscriber’s subscriber’s calls are considered as incoming (that is, as arriving at the switch or the service bureau), while calls initiated by the service bureau or the switch are considered outgoing.

 From EPO application N 0181164 (class H 04 M 11/04, 1986), a method is known for generating a special call in a switching communication system for servicing a line and for servicing a plurality of other lines, and the special service call contains an identifying indicator.

 From the same application EPO N 0181164 there is known a switching system for making a special service call and sending it to a destination containing means that respond to receiving a special service call in the switching system, while the special service call contains an identifying indicator.

 From the same application EPO N 0181164, a method for modifying features in a communication communication system is provided, equipped with means for determining the characteristics of incoming and outgoing calls for a line connected to a switching system, comprising the step of individually turning features on and off for said line in response to control signals received from the line signs and the maintenance phase of other signs, regardless of the signs received from the line control signals signs.

 In the known methods and system, the transmitted data stream from the calling subscriber to the service bureau can be interrupted by some signals, for example, a call waiting signal, which is fed to the switching system if the resident subscriber from whom the alarm is transmitted has a call waiting device , and another resident accidentally makes a call during a telemetric call. Moreover, the use of such equipment limits the subscriber’s ability to connect to devices that enable the subscriber to refuse services in a particular area of the long-distance communication service, if the service bureau is accidentally located in another area of the long-distance communication line. Consequently, the disadvantage of the known technical solutions is the presence of a rather significant interplay between a wide class of modern telecommunication services and telemetry services for transmitting various messages and alarms with remote control, including with the remote initiation of their operation.

 In order to overcome this drawback and achieve some progress in comparison with the existing level of technology in the method of generating a special call in a switching communication system for servicing a line and for serving many other lines, the special service call contains an identifying indicator, according to the invention, identifying a special call indicator on the service shuts down some class of subscriber features for the mentioned line, and this class of features and identified by an identifying indicator and contains signs that may interfere with a special service call, operation in the switching system to receive a special service call in order to ensure that this special service call passes to the destination, and those signs that may interfere with the special service call, automatically shut down after a special service call passes through the switching system in the direction of the destination.

 The method may further comprise the step of re-enabling the features of the class for the line after the end of a special service call.

 An identifying indicator may be represented by an access code to clearly distinguish special service calls from other calls.

 The access code can be marked with non-digital meaning, which makes it easy to distinguish the access code from the first digits of the dialed number.

 The identifying indicator may be represented by a special indicator in the message header of the digital communications network with integrated services (CSCS).

 A special indicator may be located in the service access point identifier (ITU) field of the header.

 The method may further comprise the step of invoicing for a special service call, so that the invoice for this call is billed to the subscriber responsible for said destination.

 One of the subscriber’s feature class can be call waiting or automatic re-call of the last outgoing call, or blocking of the screening check list, or restriction of the telephone number zone code (TNZ), or refusal of regular outgoing service, or indication of waiting for an audio message.

 One of the renewable signs may be waiting for a call or an indication of waiting for an audio message, or blocking the list of screening tests, or restrictions of the TNZ code.

 The step of further making the call may comprise a sub-step for passing the call through the automatic call distribution means or a sub-step for passing the call through the multi-line search facility.

 The method may further comprise, even before a special service call is sent to the destination, a sub-step of checking whether the dialed destination number is one of the telemetry call list numbers.

 To overcome the same drawback and achieve the same technical result in the switching system to form a special service call and send it to the destination containing means that respond to receiving a special service call in the switching system, the special service call contains an identifying indicator, according to the invention, a special service call contains an identifying indicator for disabling some class of signs of the subscriber line, cat The latter sends this special service call, the aforementioned class of subscriber attributes contains incoming and outgoing call signs that may interfere with the special service call, and means that are sensitive to a special service call to send a special service call to the destination.

 The switching system may further comprise a central office servicing unit connected via a communication channel for receiving call signals from the telemetry block of the subscriber's premises.

 At the same time, the central office servicing unit may additionally contain means for connecting to a public switched telephone exchange switch in order to have access to the said destination.

 A destination may have multiple serving devices and further comprise an automatic call dispenser for connecting the outputs of one or more central office service units to individual serving destination devices.

 To overcome the same drawback and achieve the same technical result in a method for modifying features in a switching communication system equipped with a means for determining the characteristics of incoming and outgoing calls for a line connected to a switching system comprising the step of individually turning features on and off for said line in response to received feature control signals from the line and the maintenance phase of other features regardless of the feature control signals received from the line, according to In response to receiving signals with a request to make a call, which is an incoming telemetric call from the mentioned line, in relation to the duration of the incoming telemetric call, and for it, the switching system temporarily suspends all the signs for the line that have the potential to interfere with the incoming telemetric call.

 At the same time, signs that have the potential to interfere with an incoming telemetric call may include, but are not limited to, waiting for a call, automatically calling the last outgoing call, waiting for an audio message, blocking the screening check list, limiting the telephone number zone (TNZ) code, and lack of ongoing initial maintenance.

 The switching system, in response to call generation request signals representing an incoming telemetric call from the line, may temporarily release features that support the incoming telemetric call during the duration of the call.

 Billing may be a sign that supports an incoming telemetry call.

 Finally, this method may further comprise the step of verifying the truth of the signals with a request to make a call to an incoming telemetry call.

 FIG. 1 is a block diagram illustrating connections for transmitting data from measuring instruments and subscriber devices; FIG. 2 and 3 show the sequence of various operations during the formation of connections from the aforementioned measuring instruments and devices.

 The analogue inbound telemetry service of the service systems described below (from the telemetry equipment interface unit to the service department) is based on the outgoing telemetry service of the service system (from the service department to the telemetry equipment interface unit). A single central office service unit (CBOO) can serve multiple offices with standard groups of analog or digital E&M communication channels between offices. The CBOO is connected to the service department or to a third party using a dial-up line, private line or packet network.

 The incoming telemetry service of the service system will be described below on the basis of its rendering of services for reading meter readings. The network architecture and the features and functions of the switch can also be used for other practical purposes, for example, in a fire alarm system, in alarm schemes of various security systems, and in a service request system for household electrical appliances.

 Using modern input tools and methods, the communication circuit of the measuring instrument interface (SIIP) (Fig. 1, block 46) directly through the switch 21 of the central office dials the number of the central office maintenance unit, which is connected to the service department or a third-party service department. In this case, there are no regulatory features associated with the call line. Call attributes such as call waiting can interrupt the flow of information, thereby causing errors or even complete termination of the call. Call rejection checklists may prevent the CIMP from placing a particular call. This interruption is inevitably associated with an additional waste of time for retransmission of information with the re-initiation of incoming telemetric calls and the inability to optimally place calls. If the subsequent processing of the telemetric call is allowed, then the SIIP scheme may or may not guarantee the operation of the switching means that are available to end users. For example, the SIAR scheme may activate the call waiting cancellation function. However, the SIIP scheme cannot turn off other linear devices of the end user, since this end user does not have a means of directly controlling the operation mode of these devices and functions.

Briefly described above, the incoming telemetric service delivery service provides a call from the end-user line to the central office service unit 20, which then establishes a connection with the service controller or with some position in the service bureau 60. The switch identifies the telemetry call based on the access code, and a second dial tone is used for the destination subscriber number. After that, the switch disconnects the linear means of the end user that does not respond to telemetric calls, and re-enables the linear means of the end user after the completion of the call. After the call is completed, an automatic message accounting (AUS) record can be made, which provides for invoicing the service for the call (reverse billing). Since these calls have the nature of a reverse billing, incoming telemetry calls may use lines that are not intended for the purpose of presenting bills for payment (empty houses, etc.)
Calls to the service department from the central office service unit can be sent to the address using the switching network of communication channels, a packet switching network, and can also be directed to the address using the so-called multi-line search groups based on the switch or using the automatic call distributor (ARV )

 SIIP scheme takes the line and dials the access code. The switch recognizes this access code and issues a second line ready signal. The switch enables / disables the end-user line facilities interrupted by telemetry call. The SIIP scheme dials a local limited group of telephone numbers that, through the telemetry channel of the service department (TSSS), enter the central office service unit (CBOO). The central office maintenance unit and the SIIP scheme exchange protective functions. The SIIP scheme gives orders through the telemetry protocol to the central office maintenance unit, which service department or third party service (hereinafter referred to as the service department) should receive the SIIP scheme information. If necessary or just desire, the service department may have a dialogue on additional security with the SIIP scheme. If the exchange of security or protective functions is not accepted, then the call is simply lost in the central office maintenance unit (CBOO). Otherwise, the CBOO transmits the information received by the SIIP scheme to the specified service department or other source of services. Two-way exchange of information can occur between the service department and the SIIP scheme. The SIPS scheme will not send a telemetry call if the end-user line is busy. If the end user is on the line, the SIIP scheme interrupts the telemetric call. The service department or CBOO ends the call by clearing the line.

 Then, an automatic message accounting (АУС) record is issued, which is presented for payment to the service department or service provider for a call (reverse billing) from the end user.

 If the end-user line is not intended for billing purposes, then access code calls are allowed through broadcasts. For example, if the end-user line has a service class such as BellSouth's first-class services (fast service using the latest tools and techniques), then the end-user line may issue a limited class of calls (for example, calls that require service, which is implemented after moving a telephone subscriber to a previously vacant house equipped with telephones or telephone jacks); the access code can be one of a limited class of calls that can be made by a line having exactly this type of service.

 The SIIP scheme should have the ability to occupy the line, dial a series of numbers and initiate a dialogue with the CBOO. These requirements are deciphered as follows.

 A telemetric call to the CBOO is initiated as a result of occupying the line with the SIIP scheme. The CBSC destination number is preceded by an access code. The first dial tone is an indicator for dialing an access code number. The second dial tone is an indicator of dialing a subscriber number, and this procedure is necessary only if the assignment scheme of the switch numbers does not allow the existence of an access code plus a subscriber number as a legally dialed number. If necessary, you must wait for a second dial tone. The CIIP circuit will not make a call if the end-user line is busy, and the CIIP circuit interrupts its call if the end user has taken the line after connecting a telemetry call. In order to initiate a call, transfer of information and the end of the transfer of information, it is necessary to conduct an appropriate dialogue between the SIIP scheme and the CBO.

 The telemetry channel of the service department (TCCS) for connecting the switch to the central central office is a two-way communication channel (incoming and outgoing). The TSSS works with the same protocol as in the case of the outgoing protocol only, however, in this case, the switch is able to forward the protocol to the CBOO. In this case, only one (multi-frequency) ST pulse is used.

 The SIIP scheme gets access to the service by transmitting the subscriber number assigned by the communication channel in the TCCS group. All calls to other channels (except TKSS) end. Successful calls are freely routed to the TSSS groups associated with the CBSC of the destination.

In the process of forming the call stage, the following functions and means are turned on or off:
Feature Functions - Action
Waiting for a canceled call - put into operation
Call Waiting - Inactive
Automatic redial (last outgoing) - idle
Billing back - put into operation
Waiting for an audio message (interruption of the dial tone) - is idle
Reject Check List Lock - Inactive
TNZ code restriction - inactive
After the call, all functions are returned to their original state.

 The call cancellation standby function is a function for users or subscribers who usually have a call waiting function to turn off said function for the next call. Call waiting function is a function by which subscribers can activate call waiting by dialing the desired number; Canceling this feature means that call waiting will not be activated during a telemetry call. Automatic recall is a function by which a subscriber dials a preset code, after which a call to the most recently dialed number will be activated immediately after releasing this number. Obviously, the end user will not want to have a telemetry call that was re-initiated after the release of the CBO. Billing is activated to invoice the customer service for the call. The standby signal (for example, an intermittent ready tone) is turned off, so that the equipment in the SIAR circuit can receive a normal dialing tone, and then the mentioned signal is activated again, since the end user has not yet received an audible or visual waiting signal (for example, a light bulb expectations) messages. The blocking of the screening check list and restrictions of the 3H code (numbering zones) are turned off to enable the transmission of a telemetry call, even if the destination is usually blocked by the subscriber from the possibility of making at least regular calls. If the above signs and functions interfere with the incoming telemetry call, you can use other functions to fix this problem.

 There are four disconnect scenarios.

 Disconnection is initiated by the CBO, a service department or other source of service.

 In this case, the CBO sends “free” signals to the TCSS. This action will force the switch to send a disconnect command (800 ms duration) to the SIIP circuit. The SIAP scheme further passes this command to the switch and becomes inactive. The switch sends the signals “freely” further to the CBOO. CBOO informs the service about the end of the call.

 Disconnection is initiated by the switch.

 In this case, the switch initiates the disconnection (800 ms in duration to the CIIP circuit. The CIIP circuit transmits signals “freely” to the switch and becomes inactive. The switch indicates the state “free” in the CBOO, and the CBOO indicates the same state to the switch. The CBOO informs the service department about the end call.

 Disconnection is initiated by the end user.

 In this case, the end user initiates the disconnection of the telemetric call by occupying the line. The SIIP scheme detects occupation of the line by the end user and informs the CBOO about this through the changed signal level. As a result, the CBOO indicates to the switch that the line is idle. The switch returns the signals "freely" to the CBOO. CBOO informs the service about the end of the call. Otherwise, the SIAR scheme can use any data signal to inform the CBOO about the occupation of the line by the end user.

 Disconnection is initiated by the SIIP scheme.

 In this case, the SIIP scheme initiates disconnection when the line is released. The switch indicates a free state in the CBOO, and the CBOO indicates a free state on the switch. CBOO informs the service about the end of the call.

 At the time of completion of the telemetric call, an automatic message recording (AUS) record is generated and issued. In this case, the AUS structure code 00500 and call type 005 are used. The standard AUS definitions are also used, except that the original area of the numbering scheme and the number and the final area of the numbering scheme and number are reversed. This exchange of positions makes it possible to check the billing of the customer service. The answer is defined as the point in time when the CBOO occupies the line. Disconnection is defined as the point in time when the CBOO or the SIIP circuit releases the line. Otherwise, for such telemetry calls, you can use a special AUS record, such a special record may require (or maybe not) the end user number and use a special record indication to identify the telemetry record.

 Calls to the service department can also be routed by multi-line search teams based on switch information or automatic call distribution (ARV). The multi-line search group distributes calls to the service department according to one of several types of search lists and search devices. Automatic call distribution (ARV), based on the switch information, ensures optimal distribution of incoming calls to the service and transfers organization and management information to this service to ensure highly efficient management of the central call resources. For example, ARV can equalize the load of incoming telemetric calls on all telephone lines of the service department, provide alternative passage through free communication channels of incoming telemetric calls and provide information about the call and the basic operations with this call.

 The physical connections between the CBOO and the service are identical to those used in the outgoing signal service. The communication protocol allows two-way data transfer, two-way initiation, and two-way disconnect scenarios.

 In FIG. 1 shows a block diagram of the principle of operation of the invention. A terminal, for example, a personal computer (PC) 10, in the service office is connected via a line or through an interoffice communication channel to the telephone switch 21. Otherwise, the terminal can be connected via a digital communications network with integrated services (CSCS) in a packet switching network . After dialing the access number and the subscriber number on the disk and after receiving confirmation of this from the control unit 30 in the switch 21, a connection is established with the central office service unit 20 (CBOO). In this case, the CBOO is located in the first central office where the switching system (switch) is installed 21. The mentioned block 20 of the CBOO is connected to a plurality of switches of the central office, for example, switches 21 and 22, telemetry channels of the service department (TSS), which in this case are simple interoffice analog or digital communication channels. Each of the switches 21 and 22, which can be located in different wire communication centers, has a switching network 23 and 24, respectively, for subsequent transmission of communication signals, such as voice signals, including also the readings of the measuring device and control signals of the operating mode of the device of the present invention. Each of these switches contains a control processor 26, the mode of operation of which is controlled by the program 28, which is stored in the storage device 27 and is designed to control the operations of the switch.

 When the connection between the control unit 30 (CU) and the CBOU 20 and the service bureau 60 is established, the BU 30 receives a data transmission signal from the CBOU or from a personal computer (PC) 10 through the service unit, in order to then launch the CIIP circuit in telemetry mode. After this, the telemetry and control signals are exchanged between the control unit 30 and the central control center 20 or the service controller 10, and the data received from the control unit 30 is transferred from the central control unit 20 to the PC 10 for further processing by the service department. In the same way, the service control signals are sent from PC 10 to the central heating station 20 for subsequent transmission to the control unit 30 so that they can be used to regulate the operation of devices directly in the subscriber’s house. If the subscriber picks up the telephone exchange at a time when the connection between the service unit and measuring instruments and / or devices that are not alarm devices is functioning at the subscriber’s location, then these communications end quickly and the subscriber receives regular service. However, an incoming call will receive a busy signal if a telemetric call is in effect at that moment.

 As shown in FIG. In an embodiment of the invention, an analog line is used, along which sound signals, a call or alarm tones are transmitted, and the analog line uses the principle of direct current detection to carry out the monitoring and control functions. In this description of the invention, the term "call" is used for greater convenience and because of its widespread use among specialists in this field, this term includes a description of any process of notifying the subscriber about the occurrence of an alarm situation, for example, about an alarm situation with a subscriber tone. For all lines of a digital communication network with integrated services (CSCS), monitoring and control signals, as well as alarm alerts are transmitted in the form of information signals on the D-channel of the subscriber line.

 TCCS is a common inter-office communication channel, for example, an analog or digital E&M communication channel, or a conventional signaling channel. Such communication channels are equipped with means by which any change in the state of the communication channel at one end is immediately transmitted to the other end using a tone signal (E & M) or out-of-band tone or information signal. Such a communication channel transmits a control signal, which is detected in the line circuit and which is passed by the switch processor to one end of the communication, in the CBOU to disconnect this unit at the moment when the subscriber occupies the line in the middle of the call to the service. If the end user takes the line during an incoming telemetric call, but not an alarm call, then the SIAR or CBOU circuit detects line occupancy and sends a line release signal to the switch to end the telemetric call and so that the end user can make the call.

 Compared with the known CBOO, the CBOO of the present invention is expanded by connecting it through communication channels to a plurality of switches, for example, switches 21, ..., 22, and there is also the possibility of connecting the CBOO of the invention through a plurality of communication channels (group of communication channels) to each switchboard. CBOO also connects with many service providers and significantly expands the scope of services, for example, provides maintenance of the security / alarm system, which allows simultaneous calls to various subscribers.

 In FIG. 1 shows details of a control unit. The protection circuit 40 is used to protect the rest of the control unit 30 from possible damage that can be caused by electrical signals that carry extremely high energy. In fact, this is an effective protection against extra-high voltage. Similar protection schemes are well known. For calls that enter the control unit 30 from the switch 21, a hazard alert circuit 42 is used to detect the original hazard alert tones used to signal the need to connect a meter interface (SIPS) to the communications circuit 46. The hazard alert circuit constantly monitors the status of the line when the line is in a ready state to detect these signals. After detecting such signals, the mentioned circuit activates the communication circuit of the interface of the measuring device, which then establishes communication with the PC 10 to exchange the read information of the measuring devices and control information to the measuring devices 50 and control information for the control devices 48. After the control cycle is completed and / or reading, as determined by the CBOO 20, the CBOO releases the line, which causes the switch 21 to send an open loop signal to the control unit with a minimum duration awn 800 ms to signal a disconnect.

 During the entire period of time, while the control unit 30 maintains an impedance in the communication line above about 10 kOhm, the central office will process this communication line as if it were in the "free" state. If the subscriber wants to use his telephone at the moment when there is an outgoing connection between the PC and the measuring device interface unit, the switch 21 will detect the busy state and forcefully interrupt the communication between the PC and the measuring device interface unit by sending the disconnection signal to the SIIP and signal free "at the CBO to complete this connection. For an incoming telemetry call, the switch receives a busy signal from the control unit to indicate a service request.

 Adaptations for communicating with devices providing a free line, such as a meter interface unit 30, are well known and described in detail, for example, in Bellcore Technical Reference TR-TSY-000030, Issue 1, June 1988.

 To process remotely initiated (i.e., incoming) communication calls, the BU 30 and the SIIP circuit 46 perform additional functions. SIAP circuit 46 controls the response mode of switch 52 in subscriber line 50. To initiate a call, SIAP circuit 46 sends a busy signal to subscriber line 50. Then the interface unit forwards the call to the service department or service desk. The switch 52 in the end-user line bypasses the regular subscriber connection, which otherwise may prohibit or block alarm calls whenever the subscriber uses this line or wants to use the phone 54. The switch 52, the operating mode of which is regulated by the SIIP 46 circuit, disconnects the phone the subscriber whenever the alarm device issues a message, for example, a message about a dangerous situation from device 49, and in this case, this message from device 49 rides without any interruption. For incoming telemetric calls, but not alarm calls, the end user takes precedence over the telemetric call, and the telemetric call will be disconnected if the end user is on the line, in this case there will be no connection through the switch 52. In addition, with the circuit 46 the measuring device can be connected to an intelligent electronic device 47, the operating mode of which can be controlled remotely and which can send an information message, for example a message with aniem location threatening situation. For such messages, the subscriber’s phone does not disconnect, and if the subscriber wants to make a call during the transmission of the message, the message will simply be retransmitted after the subscriber disconnects.

 In FIG. 1 also shows an automatic call dispenser (BRA) 24, which is used to distribute calls from a plurality of central office service units to multiple service ports or a service bureau 60. The switches 71, ..., 72 are connected to the second central office service unit 70, which, in turn, is connected to the ARV 24. The ARV 24 is also connected to the redundant information flow service bureau 61 for processing the service overload. The distributor 24 calls allows peaks of telephone conversations using one of the switches 21, ..., 22; 71, ..., 72. Otherwise, the outputs of the central service units 20, 70, 74 can be connected directly via a private line or as a result of a dialed connection to a single port or to a group of ports via a switching network 23 and then to the service department or bureau 60 service.

 In FIG. Figure 2 shows the sequence of operations in the office in response to a remote telemetry call. Block 702 indicates that the office is receiving a call. Block 704 indicates the beginning of the collection of digital information. Check 706 is used to determine if the leading digits are digits of a special access code, for example, # 67 to identify this special class of calls. If this is not a special access code, then this call is processed (block 708) in the usual way. If it is a special access code, then the interfering functions allocated for this line suspend their operation specifically for this call (block 710) and the billing process starts (block 712). Among the functions that stop working for the duration of the telemetric call are call waiting, blocking the outgoing call of the screening list, blocking the outgoing call for specific telephone number zones (TNZ), as well as user functions such as automatic callback (end user automatically calls the last incoming number), automatic re-call (the end user automatically calls the last outgoing number), a signal waiting tone (intermittent dial tone) and rejection of the started service. In general, any function that may interfere with the establishment of a telemetry call and tone signaling required to transmit data over a telemetry call connection is canceled for the duration of the telemetry call. Automatic callback is one of the functions that is not activated after the call is completed, since at that moment the last number becomes the number of the service department or service desk, although in this case it is possible to program the switch to restore the desired function using the automatic callback number that was stored in the switchboard even before the telemetric call arrives. After collecting all the digits for the called number, the switch 21 checks the correctness of the dialed number (check 714). Check 714 is necessary to protect users from the procedure when all their calls collect calls by dialing a special access code. If check 714 detects that the dialed number is a service desk number that represents telemetry service, then this call ends for the dialed number (block 716). If not, then the call is simply dropped. After the call is completed, the communication circuit of the meter interface can perform the operation of acknowledging the establishment of communication with the service desk, including the password, so that unauthorized subscribers could not have access to this service desk. Then, when the call is completed and either end is disconnected (block 718), an invoice record is prepared for this call, including billing, and the suspended functions are resumed for this line (block 722).

 FIG. 3 shows the corresponding actions for the ISSC line. The CSKU switch receives the message from the CSKU line as an initial action (block 802). This message includes the called number. The switch checks the service access point identifier (ITDU) field (check 806) of the received message to determine whether it is a telemetric call or not. If this is not a telemetric call, then the call undergoes the usual call processing of the MSC (block 808). If the call is a telemetric call, then all line functions are suspended (block 810) and the rest of the call is processed essentially the same as the previously described telemetric calls from analog lines.

 It should be borne in mind that the above description refers to only one preferred embodiment of the invention. It is clear to those skilled in the art that numerous changes and modifications are possible without departing from the scope of the invention. Thus, the invention is limited only by the scope defined in the attached claims.

Claims (29)

 1. A method of generating a special call in a switching communication system for servicing a line and many other lines, the special service call comprising an identifying indicator, characterized in that the identifying indicator of a special service call disconnects some class of subscriber attributes for said line, moreover, this class of signs is identified by an identifying indicator and contains signs that may interfere with a special service call, operation in the switching system to receive a special service call in order to ensure that this special service call passes to the destination and those signs that may interfere with the special service call are automatically disabled after the special service call passes through the switching system to destination direction.  2. The method according to claim 1, characterized in that it further comprises the step of re-enabling the features of said class for the line after the end of a special service call.  3. The method according to claim 1, characterized in that the identifying indicator is represented by an access code to clearly distinguish special service calls from other calls.  4. The method according to claim 3, characterized in that the access code is marked with a non-digital meaning, so that the access code is easily distinguished from the first digits of the dialed subscriber number.  5. The method according to claim 1, characterized in that the identifying indicator is represented by a special indicator in the message header of a digital communication network with integrated services (CSCS).  6. The method according to claim 5, characterized in that the special indicator is located in the identifier field of the service access point (ITDU) of the above-mentioned header.  7. The method according to claim 1, characterized in that it further comprises the step of invoicing for a special service call, so that the invoice for this call is billed to the subscriber who is responsible for the said destination.  8. The method according to claim 1, characterized in that one of the subscriber’s feature class is call waiting.  9. The method according to claim 1, characterized in that one of the subscriber’s feature class is the automatic re-call of the last outgoing call.  10. The method according to claim 1, characterized in that one of the class of features of the subscriber is to block the list of rejection checks.  11. The method according to claim 1, characterized in that one of the class of subscriber attributes is the restriction of the telephone number zone code (TNZ).  12. The method according to claim 1, characterized in that one of the class of signs of the subscriber is the rejection of regular outgoing services.  13. The method according to p. 12, characterized in that one of the class of signs of the subscriber is an indication of the expectation of an audio message.  14. The method according to claim 2, characterized in that one of the renewable signs is waiting for a call.  15. The method according to claim 2, characterized in that one of the renewable signs is an indication of the expectation of an audio message.  16. The method according to claim 2, characterized in that one of the renewable signs is the blocking of the list of screening inspection.  17. The method according to claim 2, characterized in that one of the renewable features are the restrictions of the TNZ code.  18. The method according to p. 1, characterized in that the said step of further sending a call contains a sub-step of the passage of the call through the automatic distribution of calls.  19. The method according to claim 1, characterized in that said step of further making a call comprises a sub-step of passing the call through the multi-line search tool.  20. The method according to claim 1, characterized in that it further comprises, prior to the sending of a special service call to the destination, a sub-step of checking whether the dialed destination number is one of the telemetry call list numbers.  21. A switching system for making a special service call and sending it to a destination containing means that are sensitive to receiving a special service call in the switching system, while the special service call contains an identifying indicator, characterized in that the special call to the service contains an identifying indicator for disabling some class of subscriber characteristics of the line that sends this special service call, and said with local characteristics comprises incoming and outgoing call features that might interfere with a call to a special service, and means responsive to the special service call, for sending a special service call to a destination.  22. The system according to item 21, characterized in that it further comprises a central office service unit, connected via a communication channel for receiving call signals from the telemetric control unit of the subscriber's packages.  23. The system of claim 22, wherein its central office service unit further comprises means for connecting to a public switched telephone exchange switch in order to have access to said destination.  24. The system of claim 22, wherein the destination has a plurality of serving devices and further comprises an automatic call dispenser for connecting the outputs of one or more central office service units to individual serving destination devices.  25. A method for modifying features in a switching communication system provided with means for determining the characteristics of incoming and outgoing calls for a line connected to the switching system, comprises the step of individually turning on and off the features for said line in response to the received control signals from the signs and the maintenance step of other signs regardless of the characteristics control signals received from the line, characterized in that, in response to receiving signals with a call formation request, representing fight incoming telemetry call from said line, in relation to the duration of the incoming telemetry call for her switching system to temporarily suspend the operation of all the attributes for the line, which have the potential to interfere with the incoming telemetry calls.  26. The method according A.25, characterized in that the signs that have the potential to interfere with an incoming telemetric call include, but are not limited to, waiting for a call, automatically calling the last outgoing call, waiting for an audio message, blocking the screening check list, restrictions on the telephone number zone (TNZ) code and the lack of ongoing initial maintenance.  27. The method according A.25, characterized in that the switching system in response to call formation request signals, which are an incoming telemetric call from the line, temporarily releases features that support the incoming telemetric call during the call.  28. The method according to item 27, wherein the verification of the account is a sign that supports the incoming telemetric call.  29. The method according to p. 27, characterized in that it further comprises the step of verifying the truth of the signals with a request for the formation of a call incoming telemetry call.

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