HomeLegacy VoiceTelrad/Telephony Glossary and Product DescriptionProduct Description

1. Product Description



The main features of the DIGITAL KEY BX, DIGITAL 400, and DIGITAL 1000 systems are listed below.  Access restriction Individual extensions may be restricted from accessing specific outside lines or groups of lines. Different access restrictions can be programmed for day and night service.













For flexibility in processing incoming calls, calls to the answering position can be routed to up to eight Incoming Call Identifier (ICI) queues that arrive at different buttons on the answering position. This allows you to answer calls on each queue with a different greeting. When calls recall to the answering position, the recalling extension's name/number is displayed.











·         Outside lines: The DIGITAL systems support ISDN Primary Rate Interface (PRI) outside lines, using the ETSI (Euro-ISDN), NT-DMS100, AT&T-4ESS or AT&T-5ESS standards, and Basic Rate Interface (BRI) outside lines, using the ETSI, NI1-DMS100, or NI1-5ESS standards, depending on public network support. The DIGITAL systems also support PRI and BRI ISDN supplementary services such as Call-By-Call Integrated Service Access (PRI only), Caller Line Presentation (CLIP), Caller Line Restriction (CLIR), and Direct Inward Dialing (DID), where supported by the public network. See ISDN Features, below.


·         Terminal lines: The DIGITAL system supports Basic Rate Interface for ISDN

terminals, using the ETSI (Euro-ISDN) or AT&T standards. This facilitates connection to the Internet, video conferencing, and communications with other ISDN terminals external to the DIGITAL system. It is possible to use both B channels on the BRI line individually or simultaneously for placing or receiving two internal or external calls on the same or on separate directory numbers (DNs). In addition to supporting the BRI bearer services, the following ISDN supplementary services are supported on the terminal lines: calling party identification presentation and restriction (CLIP and CLIR) and ETSI multiple subscriber number (MSN).




For T1 carriers caller identification is done via the Automated Number Identification (ANI) protocol. For ISDN carriers, this is done via the Caller Line Identification Presentation (CLIP) protocol. For ISDN carriers the system supports both CLIP and Caller Line Identification Restriction (CLIR) that can be programmed to operate on a call-by-call basis (see ISDN Features, below). The ANI caller identification feature for T1 can be programmed to show the calling party ID number on a trunk-by-trunk basis, where supported by the outside lines.


You can program the DIGITAL system to display either the incoming caller ID name or number.


In addition to sending the Caller ID number to the station display, the Caller ID interfaces with ImaGEN, ISMDR, and TelradLINK. A major advantage is call routing based on the incoming Caller ID number.  ImaGEN can use the Caller ID data to route incoming calls to a specific extension. This enables you to route a call directly to the person who should be processing it. Up to 1,000 Caller ID entries can be defined.


The Caller ID number data is forwarded to the ISMDR database. The Caller ID number data is also processed for calls made or received via the proprietary interface TelradLINK, TSAPI, and TAPI applications. With these applications based on the caller ID/ANI information, customer records can be sent as screen pops on your PC. You see the calling party's file while you receive the call, letting you review the file before speaking to the customer.




·         Transfer to mailbox button

·         Password

·         Immediate answer to voice message.


·         Class Of Service (COS) - Extensions are assigned a Class of Service, through which access and restriction profiles to various system features and outside lines are programmed. The Class of Service may be different for Day and Night operation. Also, the DIGITAL systems may be programmed to provide five global (system-wide) COSs that may be accessed by any user with the appropriate password. Users with the appropriate password may also use their Class of Service at another station.


·         Configuration backup and restore - From either a local or remote location, a customer's configuration data can be uploaded from the system to a PC, for backing up onto disk, or restored (downloaded) from the PC to the system, to update a system configuration.


·         CTI (Computer Telephone Integration) applications - CTI applications, including Telephone Application Programming Interface (TAPI), Telephone Services Application Programming Interface (TSAPI), and the proprietary interface TelradLINK, enable integration of your DIGITAL systems and your personal computer.


·         Day and night service - For day and night modes, various call handling parameters for features (such as incoming ring routing and Class Of Service assignment) may be programmed. Day or night service mode is normally activated from the attendant position.


·         Dial-By-Name (Automated Attendant DBN)*


·         DID analysis - The DIGITAL systems’ Direct Inward Dialing (DID) analysis system allows the handling of DID numbers, received from the public exchange or the private network, which contain more than four digits. DID analysis also allows the processing of incoming DID calls directed to specific trunk groups, where supported by the public exchange.


·         Digital stations - The DIGITAL KEY BX, DIGITAL 400, and DIGITAL 1000 systems supports all seven models of Telrad Avanti family of digital telephone sets.


·         Direct In Lines (DIL) - Incoming calls on lines in the DIGITAL systems can be programmed to terminate directly at an extension, without being transferred from an attendant position.


·         Direct Inward Dialing (DID) - Since the DIGITAL systems have the ability to translate incoming dialed digits, they support Direct Inward Dialing from a Central Office. This enables outside callers to dial directly to a particular extension within the system, without the intervention of an attendant.  With the DIGITAL KEY BX system, you can store 200 number translations, with the DIGITAL 400 system, 400 numbers, and with the DIGITAL 1000 system 1500 numbers.


·         Direct Inward System Access (DISA) - An outside caller may dial into the system, access system features and, after dialing a security password, may even dial out of the system on the lines of the

·         DIGITAL system. A DID number can be routed to DISA. To prevent unauthorized calls, DISA may be deactivated during night service.


·         Direct Outward Dialing (DOD) - Outside calls, including long-distance and international calls, can be placed from any extension, depending on system programming, without the intervention of an attendant.


·         Directory assistance


·         Door Unit interface - An attendant and up to four designated stations can be alerted to a person at the front door by an audio warning, an indication on the station's display, and a programmed station DOOR UNIT button. They may then converse with the person, and release the door lock. The door unit has a distinctive ring so that it can be easily distinguished. Door units can be ring routed to different locations in day and night mode.


·         DSS Add-on unit - The Direct Station Select (DSS) Add-on unit provides one-touch dialing of up to 120 Directory Numbers and speed dial numbers and a visual Busy Lamp Field (BLF) indication for up to 120 extensions. Up to four units may be chained together and attached to any Avanti Attendant, Avanti 3025, Avanti 3020F, Avanti 3020H, Avanti 3015DF, Avanti 3015DH, or Avanti 3015H set. Alternatively you can shift between the four button maps on a single DSS Add-on unit. With the DIGITAL 400 and DIGITAL 1000 systems, up to eight button maps may be programmed with a maximum of four assigned to each DSS Add-on unit.  The DIGITAL 1000 system supports up to 48 DSS Add-on units, while the DIGITAL 400 and DIGITAL KEY BX support 16 and eight DSS units, respectively.


·         DTMF signaling to SLT ports - The DIGITAL systems provide DTMF signaling to SLT ports to enable operation of external equipment such as standalone Voice-Store-and-Forward machines, facsimile machines, etc. Elapsed time starter For each trunk or trunk group, you can define the delay after dial completion before the system starts timing the call.


·         Equal access support - You may choose a particular carrier for a call. If dialing via Least Cost Routing (LCR), the system selects the most economical carrier automatically. Different restriction routines can be defined for calls on different carriers.


·         Error message history file - Records of system errors, which generate system alarms and diagnostic messages, are stored in the Error Handling Unit (EHU) history file. This enables maintenance technicians to see, at a glance, the source and history of system malfunctions.


·         External bell interface - Incoming calls arriving in a noisy environment or at distant extensions can be programmed to ring at external bells. This ensures that all calls can be heard. Different ringing patterns can be programmed for day and night service. Up to four external bells may be configured in the DIGITAL KEY BX system, up to eight in the DIGTAL 400 system, and up to 48 in the DIGITAL 1000 system.


·         Flash type - You can define the default flash type for the system as either flash or signal. For individual calls you can override the default flash type. The preferred default depends on how your DIGITAL system is configured. 


·         Flexible Numbering Plan (FNP) - The code assigned to each extension, trunk, trunk group, or feature is flexible. The customer can select the code (up to four digits long) to be dialed when accessing each facility in the system. 


·         Half Private Trunk Groups (HPTG) - Half private trunks are regular private trunks that, for outgoing calls only, are grouped under a single Flexible Numbering Plan (FNP). In other words, they can be called directly from the outside but share one trunk group access code for placing outside calls. This allows stations with many buttons to receive the trunk

·         appearance and users of more simple stations to select outgoing trunks by using a single code.


·         Hearing aid compatible - All of the telephones available with the DIGITAL family of systems are hearing aid compatible.


·         Hunt groups - Groups of extensions, such as those within a company department, can be assigned a single Directory Number (DN). Calls placed or routed to that DN ring at all extensions within the group, in sequence, according to a pre-defined algorithm.


·         Hybrid key/PBX configuration - The DIGITAL systems can function as either key, PBX, or hybrid key/PBX systems, to suit any customer application requirements.


·         Incoming call routing - Incoming calls can be routed, per trunk or trunk group, to specific extensions or groups of extensions. Up to 16 extensions may be programmed to ring for an incoming call.


·         Intercom restriction - Four hierarchical intercom groups can be defined in which extensions belonging to a specific group can dial other extensions in the same, or in a lower intercom

·         group, but are restricted from dialing extensions belonging to intercom groups higher in the hierarchy.


·         Internal page zones - Up to eight internal page zones may be defined in the DIGITAL KEY BX and DIGITAL 400 systems, and up to 16 internal page zones may be defined in the DIGITAL 1000 system. Each extension may be granted or denied access to each page zone. Announcements to internal page zones may be routed  simultaneously to a public address system.


·         ISDN (Integrated Services Digital Network) - ISDN Primary Rate Interface to outside lines following ETSI (Euro-ISDN), NT-DMS100, and AT&T-4ESS and 5ESS standards is supported. Each ISDN Primary Rate Interface PRI24 card provides a 23B+D channel interface to the ISDN-based public switch network and the ability to access ISDN supplementary services (where supported by the public network).


Each ISDN Primary Rate Interface PRI30 card provides a 30B+D channel interface to the ISDN-based public switch network and the ability to access ISDN supplementary services (where supported by the public network). These services include Calling Line Identification Presentation, Calling Line Identification Restriction, Direct Inward Dialing, and Call-By-Call Integrated Service Access (see ISDN Features, below).


The DIGITAL system can generate busy, ring, and dial tones for ISDN PRI lines when these tones are not supplied by the CO. ISDN Basic Rate Interface to outside lines following ETSI, NI1-DMS100, or NI1-5ESS standards is supported. The BRT card provides four 2B+D channels for Basic Rate Interface to the ISDN-based public switch network and the ability to access ISDN supplementary services (where supported by the public network).


Basic Rate Interface is also provided for ISDN stations and terminals where ETSI (Euro) or AT&T ISDN protocol is supported. Each Basic Rate Interface station/terminal card provides four 2B+D channels.










Therefore, you may assign the DNs of other stations to a telephone in an MSA group so that any station in the group can answer incoming calls being transferred to the group, or can make outgoing calls using another station's DN. You can have multiple appearances of the same DN in one MDN group and multiple DN hunting on the same station.


You can also assign a station a virtual DN to allow you to access an additional line. Each incoming or outgoing call is assigned to a button. Depending on which extension the call is for, a different LED lights so that the person answering the call knows exactly which extension is being called. This makes it easy to program the system so that a secretary can screen calls for one or more managers (see Manager/secretary, above) or for a group of employees, e.g. the members of a sales team. Incoming calls can be screened and forwarded, either to the specific person who should handle the call, or to the first available person from the group.


You can assign a DID line to one DN at each telephone (programmed with MSA) so that callers can be given a direct line to reach the person handling their business, while other calls can be sent to the same telephone using the other DNs appearing on it.


Call forwarding of internal or external calls can be programmed separately for each DN assigned to a station, or all the DNs can be forwarded to the same destination. 


All of the features described under Call Forwarding in the User Features, below, can be used with MSA.  In addition, the system can be programmed so that call forwarding for a DN can be done from any telephone on which the DN appears.










Rate Interface can also be used to connect DIGITAL systems in a network. See ISDN Features, below.



·         Offline: A system configuration can be prepared offline on an administration PC and stored on hard or floppy disk, without the PC being connected to the DIGITAL system.


·         Online: When the administration PC is connected online to a DIGITAL system, either locally, or remotely via modem, a complete configuration may be downloaded from the PC or backed up to the PC, modifications may be made to the system configuration and all maintenance procedures may be accessed.










Different ringing programs can be configured for day and night service.






















·         Ground start: The DIGITAL system interfaces with ground-start outside lines via a COG or T1 card.


·         Loop start: The DIGITAL system interfaces with loop-start outside lines via a COL, CHL, COG, or T1/E1 card; in addition, in the DIGITAL KEY BX system, four ports are included on the MPD card.


·         ISDN Primary Rate Interface: The DIGITAL system interfaces with the public network ISDN Primary Rate Interface channels via a PRI24 and PRI30 cards, where supported by the public network (see ISDN Features, below).


·         ISDN Basic Rate Interface: The DIGITAL system interfaces with the public network ISDN Basic Rate Interface channels via BRT and BHT cards, where supported by the public network (see ISDN Features, below).


·         DPNSS interface: The DIGITAL system interfaces with DPNSS lines for networking DIGITAL switches, even with other vendor switches. QSIG interface: The DIGITAL system interfaces with QSIG lines to network a large number of switches supplied by different vendors.


·         Tie line interface: The DIGITAL system interfaces with tie lines via an EMD card or a T1/ E1 card.


·         Direct Inward Dial (DID): The DIGITAL system translates incoming dialed digits to enable direct inward dialing to specific extensions.


·         Open loop detection: If supported by the central office, the DIGITAL system recognizes an open loop state when a call has been placed, and it disconnects the line.


·         Pulse or DTMF: Each trunk in the DIGITAL system can be programmed as a pulse or DTMF trunk.


·         Pulse to DTMF conversion: When required by certain types of calls over a number of carriers, the DIGITAL system can dial (via LCR) both pulse and DTMF for a single subscriber number. Pulse-to-DTMF conversion of an outside line can also be included in all types of automatic dialing; that is, speed dial, redial, save/repeat, and automatic redial.


·         Tone detection: To enable automatic redial, auto dialer (scanner), and speed dial chaining, the DIGITAL system has call progress tone detectors that can recognize dial tone, busy tone, reorder tone, and ringback tone.


·         Battery reverse detection: When connected to an inter-office trunk, the DIGITAL system can detect reverse polarity caused by a closed loop.






The main DIGITAL systems' ISDN features are described below. Call-By-Call Integrated Service Access On a call-by-call basis, based on the number dialed, the system, after connecting to an ISDN channel, can request PRI ISDN services such as Outward Wide Area Telephone Service (OUTWATS), foreign exchange (FX), or tie lines from the public network. With call-by-call integrated service access, you have a great amount of flexibility. For each call, any ISDN channel can provide you with any of the services supported by the public switch. Therefore, you do not need the expense and trouble of a dedicated line for each service that you want to use.











The main DIGITAL systems' private networking features are described below.



Calls to destinations within the network can be routed along various tie routes throughout the branches of the private network or, if the tie lines are not available, along ISDN, DPNSS, QSIG, T1/E1, DID, or exchange outside lines. Calls to outside numbers are routed along the most efficient and economical route. For example, calls may be routed via the private network to the branch closest to the destination or routed directly to the public exchange, whichever is more practical.



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