Abstract: A system and method are presented for reducing intermodulation products in a cellular radio system. The cellular radio system constructs and stores modified channel sets that have a reduced measure of homogeneity. The cellular radio system selects a channel number from the appropriate modified channel set in order to support a call. This invention reduces radio interference, thus improving the quality of service and increasing the call capacity of the cellular radio system.

Abstract: A finite state machine that implements the ETSI Intelligent Network Capability Set 1 for INAP protocol using a first finite state machine connected to a second finite state machine. To accomplish this implementation, the first finite state machine receives inputs and makes initial state transition choices. Once the first finite state machine has made an initial choice, the second finite state machine checks to see if the first finite state machine has transitioned to the appropriate state and, if it has not, give feedback to the finite state machine to the appropriate state. Once the appropriate state is reached, the outputs of the first finite state machine are valid and available. The finite state machines may be realized as physical logical devices or virtually using VFSM technology.

Abstract: A line interface unit terminates individual subscriber lines and supports conventional telephone service and high speed data service. It provides an interface between subscriber customer premises equipment and central office equipment. The use of large diplex filters is not required in order to terminate subscriber lines at the central office while providing high speed data services.

Abstract: A telecommunication network includes the first subscriber served by one type of telecommunication switch and a second subscriber served by a different type of telecommunication switch. A group affiliation parameter which defines an organization of which the first subscriber is a member is included in a call setup message. Upon receiving the call setup message at a telecommunication switch associated with a called second subscriber, a determination is made of whether the first and second subscribers are members of the same organization. Upon determining that the first and second subscribers are members of the same organization, call handling parameters associated with the first organization are used to process the call request to allow common control of such calls even though the first and second subscribers are associated with different types of telecommunications equipment.

Abstract: Records stored in a database are reset on an as-accessed basis. A record in the database to receive new data is identified when new data arrives to be incorporated with existing data in a given field. A next reset date stored in the record is read and compared with the current date. If the current date is later than the next reset date, the existing data in the field is replaced with a predetermined default value prior to incorporating or incrementing the new data in the field. Additionally, another next reset date is calculated and substituted for the previous next reset date in the record.

Abstract: Glitchless switching between active and standby telecommunication apparatus having hierarchical nested parity bits is provided. A higher order parity bit is calculated based on defined data as well as a lower order parity bit. A method is provided for aligning each parity bit generated by a standby processor with a corresponding parity bit independently generated by an active processor. This alignment is accomplished prior to output frames of data being supplied by the standby processor in order to provide glitchless switching such that the first frame of data supplied by the standby processor contains parity bits which are in agreement with the corresponding data in the frame.

Abstract: The transmission of messages among multiple processors is controlled by the use of token and message interrupts. A token interrupt must be received from the processor sought to perform message processing. Failure to receive such a token interrupt prohibits requesting processors from making processing demands, i.e. sending a message interrupt, to the processor. Message interrupts, which may only be transmitted following receipt of a token interrupt, identify commands and user messages to be processed by a receiving processor. This permits instructions and multiple messages to be handled by a processor based on receipt of a single message interrupt. This technique also allows a processor under a temporary heavy load to defer the handling of other processing requests by delaying the transmission of a token interrupt.

Abstract: Remote call pick-up is provided for analog telephones. Upon receiving a call request for a first analog CPE, a first record associated with the first CPE is read. The record contains a directory number for a second analog CPE. The first CPE is rung with a standard ring pattern and the second CPE is concurrently rung with an alternate ring pattern signifying that the second CPE is not the original call destination. The call is completed to the second CPE if a remote call pick-up code is received from the second CPE before the first CPE goes off-hook.

Abstract: A first validation circuit utilizes residual energy unaccounted for by a linear predictive coding model for a specified order of model as a criteria on which to make a validity determination of whether a valid tone or digit has been received. A second validation circuit operating in conjunction with the first validation circuit utilizes discrete Fourier transforms at the center and adjacent frequencies to energy peaks associated with tones. A ratio of the peak energy to the adjacent energies is utilized in combination with corresponding thresholds to make a validity determination. The combination of the first and second validation circuit provides a high level of confidence that a particular tone or digit has been detected.

Abstract: A destination telecommunication switch receives a request to establish a call to a first party served by the switch. The request includes call type data that identifies the party originating the call request as one of a plurality of call categories. A first record associated with the first party is read from a database. The first record includes at least one set of data which defines a call category and a corresponding call processing technique to be utilized for the call category. The switch processes the incoming call in accordance with the predetermined call category handling if the incoming call is identified by call category data in the database.

Abstract: A telecommunication network supports subscribers and recognizes a request for call origination by a calling party on an associated communication line. A first record in a database is located based on the identification of the calling party's line. A first set of predetermined features is determined based on information contained in the first record. A personal identification number of the calling party is received. A second record in a database is located based upon the PIN; the second record is independent from the first record. A second set of predetermined features is determined based upon information contained in the second record. The set of features made available to the calling party is determined based on a consideration of the total set of call features in the first and second sets of features.

Abstract: A telecommunication network serves first subscribers by a first Centrex telephone exchange (CTX) via a first telecommunication switch. A first signal is received at the first switch from the first CTX which indicates that call origination services are to be provided directly by a second public network switch for a first subscriber. The second switch is disposed at a hierarchical level above the first switch. A second signal is received at the second switch from the first CTX indicative of the identity of the first subscriber. A record is located in a database coupled to the second switch based on the identification of the first subscriber. A group affiliation parameter stored in said record is identified; the group affiliation parameter defines one organization of which the first subscriber is a member.

Abstract: A telecommunication network includes a first local exchange carrier (LEC) switch that provides service to first subscribers. A first signal from the first switch is received at a second telecommunication switch disposed at a hierarchical level above the first switch. The first signal indicates to the second switch that call origination services are to be provided directly by the second switch for one of the first subscribers. A second signal is received at the second switch via the first switch indicative of the identification of the one first subscriber. A record in a database coupled to the second switch is located in response to receiving the second signal. A group affiliation parameter stored in said record is identified; the group affiliation parameter defines one organization of which the one first subscriber is a member. The second switch transmits a call setup message to a third switch associated with the second subscriber.

Abstract: A telecommunication network has first and second subscribers connected to first and second telecommunication switches, respectively. A third switch is disposed at a hierarchical level above the second switch and receives a call setup message. The call setup message includes a first group affiliation parameter defining one organization of which the first subscriber is a member and a destination number of the second subscriber called by the first subscriber. A record in a database coupled to the third switch is located in response to receiving the call setup message. The located record is based on the destination number contained in the call setup message. A call screening parameter stored in the record is also identified. A determination is made of whether the call will be allowed to terminate to the second subscriber based on a comparison of the call screening parameter and the first group affiliation parameter. Thus, call screening is based on the membership of the first subscriber in an organization.

Abstract: A telecommunication network includes first subscribers supported by a first local telecommunication switch. A first signal is received from the first switch at a second telecommunication switch disposed at a hierarchical level above the first switch. The first signal indicates to the second switch that features based on organizational affiliation of the calling party are to be provided. A second signal is received at the second switch from the first switch indicative of the identification of the calling party. A record in a database coupled to the second switch is located in response to receiving the second signal; the location of the record being based on the identification of the calling party. A group affiliation parameter stored in said record is identified; the group affiliation parameter defines one organization of which the calling party is a member. The second switch transmits a call setup message to a third switch associated with a called party.

Abstract: A telecommunication network includes first subscribers served by a first independent PBX supported by a first telecommunication switch. The first switch receives a first signal from the first PBX indicating that call origination services for a first subscriber are to be provided directly by a second switch disposed at a hierarchical level above the first switch. A second signal received by the second switch identifies the first subscriber. A record is located in a database coupled to the second switch based upon the identification of the calling subscriber. A group affiliation parameter stored in said record is identified; the group affiliation parameter defines one organization of which the one first subscriber is a member. The second switch transmits a call setup message to a third switch associated with the second subscriber; the call setup message includes the group affiliation parameter so that the first subscriber's membership in the one organization can be used in further call processing.

Abstract: A plurality of telecommunication switches are coupled to agent communication terminals (ACTs) which are used by agents for handling incoming calls. An integrated control system is coupled to the ACTs and controls the distribution of incoming calls among the ACTs. An intelligent node in the system can access an agent queue that stores data indicating availability of ACTs to handle the call and a call queue which stores data concerning calls waiting for ACD service. A database stores processing instructions for the handling of incoming calls based on data contained in the agent and call queues, and subscriber specified instructions.

Abstract: A second set of telecommunication devices is arranged to substantially mirror a first set of telecommunication devices in order to provide redundancy. First and second computer modules are included, respectively, in the first and second sets of devices wherein each module is capable of providing operating system control of the system and both modules initially operating with the same operating system. Only one of the computer modules controls the system at a given time. One of the devices of each pair of devices in the first and second sets of devices is isolated from the corresponding other device. The isolated computer module is loaded with a new operating system and tested by allowing the new operating system to control the isolated devices. This permits testing of the new operating system while maintaining uninterrupted control which is provided by the other devices operating under the same operating system.

Abstract: A speech recognition method implemented in a computer system recognizes words without requiring prior creation of models for such words based on spoken entries. A key word is entered in nonspoken form and a string of phonemes are defined by the speech recognizer to represent the new key word. A response signal is generated from each phoneme in the new key word model. Such response signals are utilized to define a multidimensional validity field for the new key word. Upon receipt of a spoken word from a user, a string of phonemes is assigned to represent the spoken word. A response signal from each phoneme in the model used to represent the spoken word is contrasted with the validity fields previously defined for the corresponding key word. A determination is made as to whether the spoken word is valid or not based on whether the response signals representing the spoken word lie within the validity fields.

Abstract: A model of a finite state machine suited for implementation in a microcomputer includes logical specifications stored in memory which determine whether a change of outputs should be effected in response to predetermined combinations of input parameters and whether a change of state should be effected based on stored logical conditions of input parameters. Additional control of the flow of the steps of the finite state machine are under the control of the designer wherein a designer controlled variable permits a selection following a state transition as to whether or not an immediate test or input parameters will be made to determine whether additional actions are required or whether a return to a determination of state transition is to be made.