Toshiba Strata Dk14, Dk40i, Dk424 General Description Manual

							Features
System Features
Strata DK General Description    5/9967
©Enhance outbound calling – StrataLink provides for outbound telephone calling and call 
control from the PC application.
©Easy setup, testing, and monitoring – StrataLink provides tools for testing the interface, 
debugging or monitoring the call events, and makes application setup easier. When you select 
from pre-defined tested applications, the proper interface is automatically assigned.
Conferencing
A variety of Conferencing combinations are available to all station users, as listed below. Stations 
and lines can be added in any order. (See “Amplified Conference Interface” on Page 62 for more 
information.)
©One or two stations and two outside lines
©Two or three stations and one outside line
©Four stations on one internal [DN] line
Credit Card Calling
Callers can make credit card calls (0 + telephone number + credit card number) that bypass Toll 
Restriction. The calls are billed to the credit card, not to the Strata DK line. The system requires 
that a specific quantity of digits be dialed; otherwise, the call will be dropped within 20 seconds to 
prevent operator-placed calls that would be billed to the Strata DK line.
Data Switching
Strata DK offers a sophisticated optional data switching capability using PDIU-DS and RPCI-DI 
that can interconnect a wide range of customer-supplied data equipment, including PCs, printers, 
and modems. Asynchronous data can be transmitted between devices connected to PDIU-DS/
RPCI-DI at speeds up to 19.2 kbps (see Table 34 on Page 89).
The system provides four data security groups to restrict data calls between groups. Dialing by PC 
(both data and voice calls) as well as modem pooling and printer sharing is supported.
Day/Night Modes
The system has three available ringing modes for routing incoming line calls. The routing 
destinations are [DNs], ACD groups, Distributed Hunt groups, Auto Attendant, DISA, and a night 
bell. The ringing modes are Day, Day2, and Night.
Each mode can be assigned a distinct ringing destination. The system can be programmed with 
either two modes (Day, Night) or three modes (Day, Day 2, Night), which can be changed by any 
station programmed with a 
1LJKW7UDQVIHU button. A supervisor’s 1LJKW/RFN button can be 
provided to prevent false changes in modes. Day/Night call routing applies to all incoming line 
types: ANI, DNIS, Caller ID, DISA, Tie, and DID lines.
Delayed Ringing
If an incoming CO, DID or Tie line or internal [DN] call rings a station [DN] and is unanswered, 
alternate stations can be programmed to ring 12 or 24 seconds later. The stations that were ringing 
initially will continue to ring after the Delayed Ringing begins. This feature is assigned on a line-
by-line and [DN] basis. 
It is also possible to direct loop or ground start CO line calls to the Strata DK built-in AA on a 
delayed ring basis. In this case, the telephone(s) that initially ring will stop ringing when the AA 
answers. 
						

							Features
System Features
68Strata DK General Description    5/99
Dialed Number Identification Service (DNIS) (DK40i and DK424 only)
This feature enables incoming DNIS (called party) telephone numbers to display on the LCDs of 
ringing telephones. DNIS is provided on analog, and/or digital (T1, ISDN PRI/BRI), DID and Tie 
lines. An optional DTMF tone receiver PCB is required for DNIS.
Normally, DNIS is associated with “1-800” type calls offered by various long distance carriers; 
however, the Strata DK can provide DNIS information over DID and Tie line circuits.
Traditionally, each 800-number is assigned to its own line group, often resulting in a large number 
of under-used lines. DNIS allows multiple numbers to ring into the same line or line group, which 
provides a more efficient use of 800-numbers. Each DNIS line is used on an as-needed basis for 
different 800-number calls.
©DK14
 does not support DNIS.
©DK40i
 supports up to 200 DNIS numbers and a maximum of 100 telephone network numbers. 
The K5RCU (DK40i) optional tone receiver PCB is required for DNIS. Each DNIS, DID or 
Tie line reduces the station capacity by one.
©DK424
 supports up to 500 DNIS numbers and a maximum of 300 telephone network 
numbers. RRCS optional tone receiver PCB is required for DNIS. See “Station and Peripherals 
Capacities” on Page 89. DNIS, DID or Tie lines do not
 reduce station capacity in DK424 
Systems, Release 4.0.
The DNIS numbers are correlated in the system database with assigned DNIS names. DNIS names 
(up to 16 alphanumeric characters) display on direct incoming, transferred, and Call Forward calls. 
This allows incoming calls to be identified and answered appropriately.
DNIS numbers can be assigned to ring unique destinations in the Day, Day2, and Night Ring 
modes (see Table 29). The DNIS (called number) digits can be received independently or 
simultaneously with ANI “calling number” digits (see “Automatic Number Identification (ANI)” 
on Page 63). 
Priority of ANI or DNIS is set for each line in system programming. DNIS digits can also be sent 
to a PC. See “Computer Telephony Integration (CTI)” on Page 66.
External Telephone Network Numbers
All DNIS/DID/Tie numbers that ring into the Strata DK can be routed externally to any outside 
telephone number. Depending on the application, the caller DNIS name may be passed to the 
destination Strata DK when routed over the telephone network.
Voice Mail
If assigned in the system database, incoming calls for each unique DNIS/DID/Tie number can be 
directly routed or Call Forwarded to a designated voice mailbox. This allows callers of each DNIS/
DID/Tie number to receive immediate personal custom greetings.
NoteThis feature is available on in-band integration only. It is not available using SMDI.
Direct Inward Dialing (DID) Lines (DK40i and DK424 only)
Based on the final digits of a dialed telephone number, DID enables incoming calls over a single 
line to directly ring one or a number of stations which share a common [DN]. DID numbers can be 
assigned to ring a number of destinations (see Ta b l e  2 9). DK14 does not support DID.
DID is provided by analog or digital (T1, ISDN PRI/BRI) lines. The TDDU and RDDU analog 
PCBs support DID. For the DK424 only, the digital T1/DS-1 (RDTU2) or ISDN PRI (RPTU) 
PCBs support DID.  
						

							Features
System Features
Strata DK General Description    5/9969
Each DID number can be assigned a Name to display on an LCD telephone that rings when the 
DID number is called. Each DID line has a single office code and a block of extension numbers 
(the final digits) that can be individually assigned in system programming to ring stations.
DID lines can directly access the remote maintenance modem and can optionally provide 
automatic Camp-on-busy when callers dial a busy [DN] on incoming DID calls. This feature 
provides a camp-on tone and distinctive LED flash at the busy station.
©DK40i
 – each DID line reduces the station capacity by one. 
©DK424, Release 4.0
 – DID lines do not reduce station capacity. 
An optional tone receiver PCB (K5RCU or RRCS) is required for DID line DTMF operation.
Direct Inward System Access (DISA)
Outside callers using a DTMF-capable telephone can dial internal stations or outgoing lines 
directly, without going through a receptionist or operator. DISA security codes and/or a verified 
account codes, each up to 15 digits, can be assigned to prevent undesired access to lines.
DISA is available to any quantity of ground or loop start lines (not Tie or DID), either directly or 
through the Strata DK built-in AA. It enables privileged users to take advantage of the benefits of 
the Strata DK even when they are not on the premises. An optional tone receiver PCB (QRCU3, 
K5RCU or RRCS) is required for DISA.
DISA can be accessed by calling into the DK built-in AA. To prevent users from calling into the 
Auto Attendant and accessing an outgoing line with DISA to make unauthorized external calls, be 
sure to use the DISA security code.
Distinctive CO Line/Directory Number Ringing
The incoming line ringing tone to digital telephones is distinct from the internal ringing tone 
indicating the type of the call. This feature is optional for standard telephones by using a different 
ring pattern.
Door Lock Control
Digital and electronic telephone station users can unlock a customer-supplied electronic door lock 
at the touch of an optional button on their telephone. 
©DK14 
supports up to two locks
©DK40i 
supports up to three locks
©DK424 RCTUA supports up to four locks; all other processors support up to five locks
Door Phones (MDFB)
Door phones are frequently mounted near building entrances and associated with a customer-
provided door lock to help screen visitors. Door phones can be assigned to ring [PDNs] and/or 
[PhDNs]. Each door phone must be connected to a DDCB or HDCB.
They also monitor sound—station users can call the door phone and listen to sounds from the 
surrounding area. In a warehouse-type environment, a door phone can work as a “hot link,” for 
example, the door phone can have a preassigned button that accesses a certain telephone [DN] in 
an office, and any common [DNs]. 
©DK14 supports up to 6 door phones
©DK40i supports up to 9 door phones
©DK424 supports up to 12 door phones 
						

							Features
System Features
70Strata DK General Description    5/99
DTMF Back Tone
The system can be programmed to allow or prevent DTMF tones from being returned to digital 
telephones when a user dials on outside lines or sends DTMF digits to a voice mail device.
DTMF and Dial Pulse CO Line Compatible
The Strata DK System works with either DTMF or rotary dial pulse CO lines on a line-by-line 
basis.
DTMF Signal Time (80/160 milliseconds)
DTMF tones that are sent via Speed Dial to lines and via automatic dialing to voice mail devices 
can be set to 80 or 160 milliseconds. The time can be set independently for line out-dialing and for 
voice mail automatic dialing. See “Continuous Dual-tone Multi-frequency (DTMF) Tone” on Page 
94.
Emergency Ringdown
Standard telephones can be programmed to automatically ring a designated extension when they 
are taken off hook, after a predetermined time without dialing. The receiving digital or electronic 
LCD station or attendant console displays the station name/number of the off-hook calling station. 
This feature does not work with digital and electronic telephones. 
In healthcare applications, this feature is known as Emergency Ringdown operation. It is used to 
assist callers who may not be able to complete a call by dialing. If a station is left off-hook, 
continuous ringing will occur at a designated extension. This feature is also known as “Hotline 
Service” for hotel/motel applications. See “Hotline Service” on Page 72 for more information.
Enhanced 911 (E911) Service
In the public safety arena, Enhanced 911 (E911) is distinguished from Regular 911 by the delivery 
of specific location information to the console of the dispatcher handling the emergency call. The 
public switched telephone network (PSTN) delivers a Caller Emergency Service Identifier 
(CESID) to the Public Safety Answering Position (PSAP) as part of the telephone call set up.  
PSAP procedures outside the telephone connection translate the CESID into a specific location to 
which emergency services can be dispatched. The Strata DK is not involved in the translation of 
CESID into Automatic Location Information (ALI).
The Strata DK40, DK40i and DK424 can accept a call dialed as “911” or “9” + “911” from any 
extension and deliver it to a specially programmed, single-line telephone port that connects to 
customer-provided, emergency call adjunct equipment. As part of the call, the DK communicates 
the originating directory number (DN) to the external equipment using DTMF signaling. The 
external equipment translates the received DN to a valid CESID, connects the call to the PSTN and 
delivers the CESID information when the call is answered. 
Centralized Automatic Message Accounting (CAMA) trunks connect the customer-provided 
equipment to the PSTN. When its CAMA trunk interfaces become available, the Strata DK424 
will be able to connect directly to CAMA trunks, eliminating the need for external equipment.   
The RMCU PCB with one RCMS subassembly provides two CAMA trunk interfaces in one 
cabinet slot. One more RMCS may be added to the RMCU for a system total of 4 CAMA trunks.
An extension dialing “911”  or “9” + “911” will be routed to its appropriate CAMA trunk. The 
DK424 will seize the CAMA trunk, dial “911,” and deliver that stations CESID once the trunk is 
answered. The DK424 stores a unique, programmable CESID for each Primary Directory Number.
The DK424 has several internal notification features. It will notify all consoles and designated 
stations of an E911 call. It may be programmed to initiate a conference call including the  
						

							Features
System Features
Strata DK General Description    5/9971
originating telephone, the PSAP and an internal emergency station. The SMDR port will generate 
a special record at the beginning of the call as well as at the end.
DK owners are urged to learn local regulations and availability of services which may  vary 
widely. A growing number of locations require a business owner to maintain accurate location 
information in a public safety database. Certain locations require E911 only for systems 
functioning as PBXs or hybrids but not as key systems. Contact your local emergency services 
provider and Local Exchange Carrier for specific information. Another useful resource is the 
National Emergency Number Association (NENA) at www.NENA.org.
  
External Page Zones
The Strata DK40i can support up to four External Page Zones and DK424 can support up to eight  
(Tables 24 and 25). Station users can access one, four or eight zones simultaneously by dialing a 
brief access code. The zones are composed of customer-supplied speaker(s) and amplifier(s) which 
interface with one or two PIOU PCBs. DK14 does not support zone paging.
Flexible Button Assignment
Each of the flexible buttons on digital and electronic telephones can be assigned for feature or CO 
line access, enabling station users access to features and lines with the touch of a button. Digital 
telephones are available in 10- and 20-button models.
Flexible Directory Numbers
A “flexible” number of digits can be programmed for station [DNs] in the Strata DK. The DK14, 
DK40i and DK424 station [DNs] can have from one to four digits. The maximum available 
number of unique station [DNs] ([PDNs] plus [PhDNs]) are listed below:
©DK14
 – up to 20 unique station [DNs] are allowed
©DK40i 
– up to 56 unique station [DNs] are allowed
©DK424
 – up to 672 unique station [DNs] are allowed
Single-digit [DNs], such as “0”, can be assigned to attendant consoles or attendant telephones. 
Flexible Line Ringing Assignment
Each CO line can be programmed to ring the Auto Attendant, night bell, DISA, remote 
maintenance modem or any station [DN] in the system. A different ringing assignment can be 
created for each of three ringing modes—Day, Day2 or Night. Stations assigned to ring can do so 
with any of the following three timing designations:
©Immediate – Stations assigned Immediate timing ring as soon as the line rings into the system.
©Delay 1 – If stations with Immediate timing have not answered within 12 seconds (3 rings), 
stations assigned Delay 1 timing also begin ringing. Immediate Ring telephones continue to 
ring when Delay 1 Ring telephones ring.
©Delay 2 – If the above stations have not answered within 24 seconds (6 rings), stations 
assigned Delay 2 timing also begin ringing. Immediate and Delay 1 Ring telephones continue 
to ring when Delay 2 Ring telephones ring.
Group Paging
Digital and electronic stations can be divided into Paging Groups. Any station user can make a 
page announcement to just one or all of these groups. The page is sent to the speakers of all idle 
telephones in a page group. For more information, see Table 34 on Page 89. 
						

							Features
System Features
72Strata DK General Description    5/99
©DK14
 and DK40i
 each support up to five Paging Groups, including the All Call Page Group.
©DK424
 supports to up to nine Paging Groups in systems operating with the RCTUC/D and 
RCTUE/F common control units (up to five are supported with either the RCTUA or 
RCTUBA/BB). These groups include the All Call Page Group.
Note Cordless DKT-2004-CTs and standard telephones are not compatible with Paging.
Handsfree Directory Number Paths
All stations can have handsfree conversations simultaneously. Because [DN] paths are 
nonblocking, the number of conversations is only limited by the amount of digital and electronic 
stations.
Hospitality Management Information System (HMIS)
The Toshiba Strata DK Hospitality Management Information System (HMIS) is a PC-based 
solution, designed to meet the specific operational needs of small- to medium-sized hotels and 
motels.
The HMIS tightly integrates with the Strata DK40i and DK424 Digital Telephone System, Release 
3.1 or higher, and the Stratagy Voice Processing System, providing a complete and fully-integrated 
hospitality package.
The HMIS is an optional turnkey package that includes both the PC and software. The packaged 
product includes a PC with a Pentium
® 133 MHz processor, 2GB hard drive, three serial ports, 
keyboard, mouse, SVGA color monitor, and software (printer not included). The HMIS software is 
a Microsoft Windows 95-based application.
The HMIS PC is dedicated to running the HMIS server program and functions as a front desk 
terminal. In applications requiring multiple front desk terminals, PC HMIS workstations can be 
networked together to share a common database.
The HMIS application provides hotel/motel features and property management capabilities that 
are not resident within the Strata DK telephone system. The HMIS is well integrated with the 
telephony features of the Strata DK telephone system to which it is attached.
The Strata HMIS provides guest check-in/check-out, up to 20-year reservation capacity, automatic 
wake-up calls, SMDR telephone call tracking and costing, billing, telephone system control, and 
many other features. See the Hospitality Management Information System General Description
 for 
details.
Hotline Service
Standard telephones can be automatically ring a designated extension if they go off hook and do 
not dial with a preprogrammed time. The receiving digital or electronic LCD station or attendant 
console displays the station name/number of the off-hook calling station. This feature does not 
work with digital and electronic telephones.
Hotline Service is very useful for hotel/motel applications, where it may be preferable to have 
lobby or public area telephones without dialing capability. Standard telephones can be 
programmed to automatically call a specific number, such as the front desk. This feature is also 
known as Emergency Ringdown in the healthcare field (see “Emergency Ringdown” on Page 70.) 
						

							Features
System Features
Strata DK General Description    5/9973
Integrated Services Digital Network (ISDN)
ISDN is a set of integrated telecommunications services, available over the public 
telecommunications networks. ISDN makes it possible to send, receive and modify information 
using telephone lines in ways that were not previously possible, such as:
©Dynamic use of individual or groups of standard (POTS), DID, Tie, FX, WATS, 800 lines on 
an as-needed basis
©Much faster call setup and data transfer up to 128 kbps
©Multi-purpose line use, including sharing lines for voice, data, fax, and video
©DID functionality based on the number dialed; without needing to reserve a block of numbers
ISDN service comes in two forms: 
©Primary Rate Interface (PRI) supports 23 or 24 simultaneous voice or data connections. PRI 
is similar to digital T-1 service and uses two pairs of wires from your phone company.
©Basic Rate Interface (BRI) supports up to two simultaneous connections using a single pair 
of wires.
National ISDN standards were first established in 1992. These were formed for all equipment 
providers and services to create a common set of functions for these new services. The public 
network is in the process of implementing nationwide the National ISDN 2 (NI-2) services and 
some locations have started National ISDN 3. Strata DK Release 4.0 is based on NI-2.
ISDN Primary Rate Interface (PRI)
PRI is the larger ISDN interface (via the RPTU) and uses the 23B+D transmission format, which 
has 23 64-kbps bearer channels and one 64-kbps data (control) channel, with total bandwidth of 
1.544 mbps.
PRI is designed as the trunk interface to the ISDN network. PRI connects the Strata DK424 
telephone system to an intra- or inter-LATA communication provider. PRI can be used to send/ 
receive voice and/or data.
More importantly, PRI can save money by enabling the multiple use of the channels on the PRI 
link for a variety of services, such as DID, Tie, FX, WATS, 800, etc., on demand. 
This capability to support multiple services and dynamically allocate channel use as needed is 
known as the call-by-call feature. PRI lines also support Calling Number Identification Services 
(CNIS).
A dealer-supplied, UL listed, Channel Service Unit (CSU) is required between the DK PRI 
interface and the PRI line provider interface in most locations of the U.S. In Canada, a CSA 
certified DSU/CSU must be installed.
ISDN Basic Rate Interface (BRI)
NoteStrata DK40i and DK424 support BRI S/T. The DK424 and DK40i will support BRI U 
basic features in Release 4.2. No supplementary features are offered in theses releases.
BRI is the smaller ISDN interface and provides two simultaneous voice or data connections with a 
single interface. BRI uses the 2B+D transmission format which is defined as two 64-kbps bearer 
channels and one 16 kbps data (control) channel. The D-channel carries call setup control data.
ISDN BRI station applications allow the connection of ISDN instruments, such as a group IV fax, 
PC, computer terminal or port, a LAN bridge, video conferencing terminal, Internet access 
devices, LAN access routers, or other devices that benefit from an all digital transmission link. 
						

							Features
System Features
74Strata DK General Description    5/99
BRI applications for the DK424 will include video conferencing, remote access servers, faster 
Internet access, point-of-sale devices and high-speed data connections from ISDN stations to the 
public ISDN network, as well as typical voice and fax connections. With the correct external 
adapter, data can be sent up to 128 kbps.
Like PRI, BRI provides CNIS, DID, Direct Inward Lines, and other data access services when 
used to access the public network.
The Strata DK424 BRI cards will support both station side and trunk side connections. The Strata 
DK424 system will also support BRI interface from the public network as a CO line service. There 
are two types of ISDN BRI interfaces: S/T type (via RBSU/RBSS) and the U-type (via RBUU/
RBUS). Both types are used in the U.S. 
The Public Switched Telephone Network provides BRI U-type lines only; therefore, a dealer-
supplied, external Network Terminal Unit (NT-1) is required to connect DK S/T-type BRI line 
circuits to the network. The NT-1 must be UL listed (U.S.) or CSA certified (Canada).
Call-by-Call Service Selection
This feature permits the grouping of individual PRI B-channels to be shared among various types 
of services specified by the customer, instead of having to dedicate each channel to a particular 
type of service. Using this common pool of channels provides much improved traffic handling 
than using dedicated channels.
This dynamic allocation of service can reduce the number of circuits required to access various 
services, especially if various services have different peak busy periods.
In Release 4.15, the DK424 will enable specifying the minimum and maximum number of B-
channels used for each service on a common set of B-channels in system programming. Minimum 
and maximum values can be set for three time periods during the day. 
These values can be used to ensure that a minimum number of channels remain available for 
incoming calls. They can also be used to determine if calls should be rejected because they exceed 
the maximum number subscribed for that service. Until Release 4.15 becomes available, Call-by-
Call minimum/maximum service will be implemented at the CO.
Call-by-Call services can be specified to map Strata DK capabilities to network services such as 
DID, Tie, FX, WATS, 800, etc. These services can be provided via the local telephone carrier or be 
connected to any ISDN inter-exchange carrier. 
Outgoing calls, specific numbers, or DID numbers can be checked against the Call-by-Call table 
which lists all valid DNs. DNs can be identified on a per station basis to enable billing calls to a 
selected service or station. All numbers used for identifying the call must be subscribed from the 
providing service, otherwise the call will be rejected by the provider.
Non-Facility Associated Signaling (NFAS)
NFAS provides the ability to create ISDN trunk groups beyond the 23 channels available with a 
single PRI. This is extremely important when Call-by-Call Services are used since all B-channels 
must be controlled using a common D-channel.
The Strata DK system will support one additional PRI (two circuits to be linked with one D-
channel). This extends the number of call-by-call B-channels to 47 (2 x 24 minus 1). This provides 
better performance and cost savings in high volume ISDN PRI applications. 
						

							Features
System Features
Strata DK General Description    5/9975
Calling Number Identification Services (CNIS)
CNIS features provide “Calling Party Information” to the network (outgoing calls) and from the 
network (incoming calls). There are four types of CNIS services:
©Number Provisioning
 for outgoing calls is controlled by subscription parameters with your 
telco provider. The choice is for the number to be necessary or not. The number sent is based 
on the call originator and the call type. The originator can be a tandem call, a station (with or 
without DID), or a station with a designated number. The type of call refers to whether it is a 
direct or redirected (call forwarded) call.
For a tandem call, the Calling Party Number digits received are the digits that will be sent. For 
a direct station call, the default number assigned to the selected service, and which is 
programmed into the Strata DK as the Listed Directory Number (LDN), will be the number 
sent. In this case, the system can send a fixed number (assigned in the system) or it can use the 
DID programming to determine the number to be sent.
©Number Screening
 is normally performed by the public network to ensure that the call being 
placed has a valid billing number. In systems with a flexible Calling Number Provisioning, the 
network can determine if the call is for a valid billing number. Based on this, it can either place 
or reject the call, rather than completing the call and billing it to the default LDN.
©Number Privacy
 allows the caller to prevent the public network from delivering the Calling 
Number to the called party on a per-call basis. Service subscribers can request that the number 
be presented or not, as a default from the public network. Subscribers can also change default 
settings. If a public telco service allows changes to be made, then a user can enter change a 
code to the setting for that call after selecting a trunk group.
©Number Delivery
 sends the calling number with the call setup message, if that number is not 
blocked. The Strata DK handles the number the same way that ANI information from T1 
trunks is handled. For instance, the number can display on the called telephone’s LCD, or it 
can be used by TAPI interfaces, or it can be recorded in SMDR data records.
NoteName Delivery will not be supported in this release, due to the lack of a common 
specification for the public ISDN network.
Least Cost Routing (LCR)
Different route plans may be designed to automatically place outgoing calls over the most cost-
efficient routes. See the table below for LCR capacities.
Three different LCR time schedules with their own priority schedules can be set up for the 
business day. Stations can be grouped into one of eight LCR classes, each with its own routing 
priority. Selected station users may have priority use of a line, even when the route with the lowest 
cost is not available. LCR is compatible with ABR.
Table 30 Least Cost Routing Capacities
DK424
Least Cost RoutingDK14DK40iRCTUARCTUBA/BBRCTUC/DRCTUE/F
LCR route plans 8 8 8 8 16 16
Area Code/Office Code exception tables 8 8 8 8 16 16
Time schedules 3 3 3 3 3 3
Station classes 4 4 4 4 8 8
Route definition tables 4 4 4 4 6 6
Modify digit tables 6 6 6 6 12 12 
						

							Features
System Features
76Strata DK General Description    5/99
Line Groups
For easy access, various types of outside lines can be assigned to groups (normally for pooled line 
and LCR applications). For example, all local lines can be assigned to one group and WATS lines 
in another group. Station users access line groups by dialing an access code or by pressing a 
feature button.
©DK14
 provides up to 4 line groups
©DK40i
 provides up to 8 line groups
©DK424
 provides up to 16 line groups
Line Queuing
A station user can use the Automatic Callback feature to enter the queue for a busy outgoing line. 
When the line becomes available, the system calls the station back. Queuing applies to single lines, 
line groups, and when calling via LCR.
Live System Programming
Programming the Strata DK from an on-site or off-site location does not interrupt the operation of 
the system in most cases. It is interrupted for hardware upgrades.
Memory Protection
If the power fails, the Strata DK has an internal battery backup that protects data and the 
customer’s programmed configuration. This information will be maintained within a powerless 
system for at least six years.
Message Waiting
Any station and most voice mail devices can leave a message waiting indication (light) on a 
designated message waiting light of a digital, electronic, or standard telephone station.
Message waiting lights can be activated when a voice mail message has been left, or they can be 
turned on by a calling station. The station user can retrieve messages by pressing the button next to 
the message waiting light.
©DK14 and DK40i 
– QSTU2 and KSTU2 PCBs do not support standard telephone MW lamps.
©DK424
 and DK40i
 – an RSTU2 PCB must be connected to a standard telephone with a MW 
lamp to enable this feature. The DK40i and DK424 provide Message Waiting to standard 
telephones with a message waiting lamp. The user can enter an access code to retrieve the 
messages. A standard station can store up to four indications. 
Multiple Directory Numbers
A [DN], sometimes called an “extension number,” is the number someone must call to reach a 
destination within the system. To maximize call coverage flexibility, station [DNs] can appear on 
multiple telephones. Also, individual telephones can have multiple [DNs] (see Figure 17).
The system provides three types of [DNs]: Primary, Secondary and Phantom. All [DNs] can be 
used to originate and answer calls. If you press a [DN] while on a call, it releases the existing call 
and provides dial tone to make another call.
©DK14 supports a maximum of 10 [PDNs] and 10 [PhDNs]
©DK40i supports a maximum of 28 [PDNs] and 28 [PhDNs]
©DK424 supports a maximum of 336 [PDNs] and 336 [PhDNs] (see Table 32 for maximum 
capacities for various common control units)