Comdial Dxp Plus Instructions Manual

							Call Forward, Recall
If the site includes ExecuMail equipment and the programmer has arranged for the ExecuMail to provide
release transfer, she or he should also arrange for the ExecuMail station to have this call forward, recall
feature. Also see the discussion titledCall Forward - Busy or Ring No-Answer, All Or Personal.
Call Park
The system can hold nine calls in park zones (also referred to as orbits) where they are retrievable by all
users in the system.
Those calls that users can park include intercom calls, outside calls, and conference calls. Users park
calls in predefined zones and then retrieve them by dialing an intercom feature code or by pressing a
preprogrammed call park button. Call park, when used with paging features, allows a user to direct calls
to roving personnel by first parking a call in an orbit and then paging the personal to tell them which orbit
holds the call. When a user retrieve a call from park orbit, the system places the call on the user selected
intercom. If the station has several intercoms arranged in a hunt list, the system always chooses the
intercom that the user selected.
Also see the discussion titledCall Park Recall.
Call Park Recall
If a call remains unanswered after the park recall time has ended, the system returns the call to the parking
station where it rings. If that telephone includes an LCD display, a message appears on it that shows the
park orbit number of the returning call as well as the line number.
The system programmer sets the call park recall times. Prior to software release 3A, he or she could
choose a minimum time of one minute; however, beginning with software release 3A, the minimum call
park recall time that the programmer can choose is 30 seconds.
Also refer to the paragraph titledCall Park.
Call Pick-Up Directed
A station user can dial a code and the intercom number of a ringing station to answer the call.
Call Pick-Up Group
If a call rings to any station in a preprogrammed pick-up group, and a second user in the group wishes to
answer the call, the second user can dial the group pick up code to answer the call. Up to 16 different
groups can exist with any number of stations in a group. The system provides group overlap by allowing
stations to be in more than one group at the same time thus enabling them to pick up calls for stations in
each group. The programmer places the stations in their logical answering groups.
Call Pick-Up System
If a call rings at any station in the system, certain other station users, such as the attendant station, can
pick up that call. That station user must dial the appropriate pick up code to answer the call, and the
station must be programmed to pick up the call. The programmer places all telephones in the same
pick-up group to enable this feature.
DXP Plus General Description GCA40–130
Understanding The Features – 59 
						

							Call Transfer—Screened
Screened call transfer allows users to first announce and then transfer both line and intercom calls from
one station to another station or group in one of two ways. If both stations have access to the line or
intercom number, the user makes a common line pickup transfer. If the other station does not have access
to the incoming line, the user makes a transfer using the system transfer feature.  The user uses the
TRANS/CONF button to effect the call transfer. Also refer to the discussion titledCall
Transfer—Unscreened with Automatic Camp-On, and Hot Transfer.
Call Transfer —Unscreened With Automatic Camp-On
Unscreened call transfer allows users to transfer both line and intercom calls from one station to another
station or group without first announcing them.  The unscreened transferred call appears at the other
station where it will ring if that station is idle or automatically camp-on and await an answer if that station
is busy. The call automatically rings back to the transferring station after a programmed recall period.
There is no limit as to how many calls that can be camped onto another station. A transferred call will
ring if the called intercom number is idle.  If the handset is off-hook, the ringing is subdued.
Call Waiting Tone
A user can send a call waiting tone to signal to a busy station that he or she wishes that station to contact
them. They do this by dialing a special code when they encounter a busy signal.  The call waiting tone
sounds at the busy station and reoccurs  until the calling party hangs up. The frequency of the call waiting
tone is preprogrammed by the programmer.
Camp-On With Automatic Call Back
After calling another station and encountering a busy signal or a ring with no answer, a user can camp on
to that station, hang up, and wait to be called back by the system when that station becomes idle or when
the user returns. Likewise, a user can camp-on to a busy line, hang up, and wait to be called back when it
becomes idle.
When the busy station becomes idle, the system rings the originating station and starts a timer. The user
of the originating station must take it off hook as soon as it rings and as soon as he or she does so, the
camped-on telephone rings.
When the user of the ring no-answer station uses it for any call activity, the system detects this activity as
a sign that the user has returned. As soon as that call activity is finished, the system rings the station that
originated the camp-on and starts a timer. The user of the originating station must take it off hook, and as
soon as he or she does so, the camped-on telephone rings.
When the busy line becomes idle, the system rings the originating station and starts a timer. The user of
the originating station must take it off hook before a preprogrammed time out occurs. As soon as he or
she does so, the camped-on line returns dial tone to the originating station. If the originating user does
not take his or her station off– hook before the time-out period elapses, the system cancels the camp-on.
If, for some reason, the system cannot ring the camped-on facility after the user takes the originating
station off hook, he or she hears busy tone and may camp-on again.
Camp–On—Call Waiting
If a user makes a call to a busy telephone, he or she can send a call waiting tone to the busy telephone and
wait on line for an answer.  As soon as the called telephone returns to idle, it will ring with the camped on
call.
Also refer to the discussion titledCall Waiting Tone.
GCA40–130 DXP Plus General Description
60 – Understanding The Features 
						

							Camp–On—No Answer
Refer to the discussion titledCamp–On With Automatic Call Back.
Clear Major Alarm Ring
Major alarm rings occur whenever a number of faults exceed a programmed threshold. You can use a
telephone station to clear a major alarm ring by pressing the  INTERCOM button and then dialing  a
feature code (default code is #09). However, the telephone station must have a class of service (COS)
assigned to it that has this feature enabled. The installer or programmer enables this feature through COS
programming.
Central Message Desk
The programmer can designate one station as the central message desk and arrange for it to have
exclusive message waiting control. A central message desk user takes messages for other system users,
controls the message waiting light at their telephones, and delivers the messages upon request.
Also refer to the discussion titledMessage Waiting.
Central Processor Switched Data Port Configuration
The CPU board provides a dual in-line pin (DIP) switch that enhances installer convenience in setting up
data communications between the DXPPlusand an external data device. It is possible to mismatch the
data port configurations between the DXPPlusand the external device in a manner that prevents data
communications from occurring. The DIP switches provide a hardware way of setting the data
configuration to a known set of parameters without the need for reprogramming the system. With the
switch set to ON, the DXPPlusprovides the following data parameters:
Parameter Maintenance Port Modem Port
Baud Rate In 9600 2400
Baud Rate Out 9600 2400
Data Bits 8 8
Stop Bits 1 1
Parity Bits None None
Flow Control None None
Common Audible Ringer Interface
Relay connections that provide dry-contact closure whenever ringing occurs are available on the central
processor unit circuit board. The relay closure tracks the ringing pattern of the applied ring signal and is
typically used to control an external ringer device.  The installer can program the particular ringing
assignment that is tracked, and the ringing assignment can be any one of those that are provided by the
flexible ringing assignment feature.
Also refer to the discussions titledAuxiliary Ringer Interface, External Paging Interface, Flexible
Ringing Assignments, Line Answer From Any Station, andNight Transfer (Of Ringing).
Communications Card Support
The communications card provides serial data ports for interfacing such items as open architecture
interface applications, PC attendant positions, and the SMDA data printer. Technicians install
communications cards on the services board, the expansion cabinet interface boards, and the main
cabinet’s auxiliary board. Each of these boards will accept two communications cards in its lower two
slots. The DXPPlussupports a maximum of 18 serial data ports. Two of these ports are the dedicated
ports provided by the CPU board while communications cards provide the remaining 16 undedicated
ports. For related information, refer to the feature description titled,Serial Data Port.
DXP Plus General Description GCA40–130
Understanding The Features – 61 
						

							Conferencing - Multiline
This feature allows one station to access other stations or lines at the same time resulting in a conference
arrangement. Users press the TRANS/CONF button to establish conferencing.
A station user can make conference calls that encompass up to five parties, including the originating
station, in any combination of lines and system stations. For example, a user can conference his or her
telephone with three lines and one other station.
After establishing a conference between his or her station and two external parties, the user can drop out
of the conference by dialing a special code. The conference between the two outside parties continues in
an unsupervised condition. During unsupervised conferences, a line-to-line connection exists through the
system.
The programmer can use the line-to-line connect duration feature to set the length of time that the system
allows an unsupervised conference to continue . Prior to software release 3A the maximum time that he or
she can choose is 30 minutes; however, beginning at software release 3A, the programmer can choose
neveras a programming option. With this programming option active, an unsupervised conference will
never recall.
NOTE: Be careful when choosing this never recall option for systems that have loop start lines without disconnect
supervision. Both distant parties can leave an unsupervised conference thus leaving the line unused yet still
active. The line will remain active until the person that set the conference rejoins it to disconnect the line.
Conference Advisory Tone
Beginning with software release 4A, the conference advisory tone feature allows programmers to
configure the system to provide an audible tone whenever more than two parties are connected in a
conference call. They may select this tone as either a one time tone or as a periodic reoccurring tone. If
they choose a reoccurring tone, they must select the time interval between the reoccurring tones.
Console Support
The DXPPlussupports the operation of a DSS/BLF console.  The system installer must use a station port
to install each DSS/BLF console; however, the programmer can assign up to four DSS/BLF consoles to
support the operation of one system station. When assigned to a station, a DSS/BLF console provides
additional programmable buttons that the user can program as direct station select (DSS) buttons with
associated busy lamp field (BLF) lights and as speed dial buttons (the console, however, does not support
second-level speed dialing). The programmer can also assign both outside lines and intercom numbers to
console buttons when necessary. The station with which the console is assigned to work does not have to
be a paired station port.
GCA40–130 DXP Plus General Description
62 – Understanding The Features 
						

							Consoleless Operation
The system can operate with or without the use of an attendant console.
Consultation Hold
When the station user presses the TRANS/CONF button while on a call, the call is placed on consultation
hold and dial tone is returned to the station. The user may then make another intercom or line call. After
speaking with this “consulted” party, the station user may do any of the following: (1) return to the held
call by selecting the line or intercom number for the held party, (2) effect a conference by pressing the
TRANS/CONF button (putting the held call, the consulted party and the station user in conference), (3)
hang up and effect a transfer of the held party to the consulted party. If the user encounters a busy or a
ring no-answer, he or she may press the TAP button to return to the held party.
Transfer considerations:
·The system default denies line-to-line transfers.
·To make an unscreened or blind transfer, press the TRANS/CONF button, dial the desired intercom
number, and hang up.
Copy Model
Refer to the discussion titledBlock Programming.
DXP Plus General Description GCA40–130
Understanding The Features – 63 
						

							D
Database Program Storage
Programmers can save and restore the DXPPlusdata base using the visual man machine interface
(VMMI). They will find this feature useful for retaining existing operating parameters and later reloading
this database after they upgrading the system’s software.
Database Programming(From Main Station)
The system administrator can use a system telephone to reprogram certain feature parameters away from
the values set by the installer using the computer-based VMMI. Included among the features that the
system administrator can program are the ability to assign prime line, prime group, or prime intercom to
the stations, and the ability to assign day and night toll restriction exception numbers to the stations.
Database Programming
System programmers employing the visual man machine interface (VMMI) program running on a
DOS-based personal computer can customize the DXPPlussystem parameters and change the system
data base. The VMMI program causes the system to down load the existing database to the PC’s memory
where the installer can make additions and changes to database. While the installer is reprogramming the
database, the system allows users to continue to use their telephones but prevents them from making
changes that affect the database’s structure. As the installer makes the changes to the database, the VMMI
program sends these changes back to the DXPPlusmemory.
Day One And Day Two Ringing
Refer to the discussion titledFlexible Ringing Assignments.
Day Restriction Level
Refer to the Discussion titledToll Restrictions.
Default Busy/Ring No-Answer Call Forward
The programmer can arrange for the system to automatically forward any calls that ring at busy
telephones or any calls that ring and are not answered after a preprogrammed number of rings. The
programmer chooses the station to receive those calls forwarded with this feature on a station-by-station
basis; he or she can also program the number of rings (0-6) the system requires until it rolls the call to the
forwarding station. The system defaults to four rings, three rings for voice mail ports. Users do not select
this operating feature since it is fully automatic; however, user-enabled call forwarding overrides this
default busy ring no-answer call forwarding.
Also see the discussions titledCall Forward - All Or Personal;andCall Forward-Busy Ring No-Answer,
All Or Personal.
GCA40–130 DXP Plus General Description
64 – Understanding The Features 
						

							Default Functional Programming
At initial power up of the system, the system operating features consist of a specific group of conditions
(default conditions). These default conditions provide a completely operational system for normal use.  A
system installer can leave the system in a defaulted state or reprogram it as desired. After
reprogramming, a programmer can restore default conditions to the system at any time they are needed as
follows:
·When a master clear is programmed, the entire system is restored to the basic default start-up operating
mode. This action erases  all customized program settings.
·When a system default is programmed, all system parameters and timing are reset to the basic start-up
settings. Further, system-wide customized data such as LCD messages and system speed dial numbers
are erased.
·When line default is programmed, all lines are set to the basic operating parameters. Any lines that are
now programmed for rotary dial are reset as tone dial.
·When station COS default is programmed, the station operating features are set to the basic operating
mode.
·When button mapping default is programmed, each button at every telephone connected to the system
is reset to the basic settings for that particular model of telephone. This means that all unique button
functions are erased.
·When the table defaults are programmed, all customized data that the programmer has entered in any
tables such as SOHVA groups and toll restriction tables are erased.  See also—Master Clearing The
System.
Delayed Ringing
Ringing assignments are programmable. A programmer can program a station to provide delayed ringing
on some lines while providing direct ringing on other lines.
Diagnostics(Limited)
The installer can use this feature to perform maintenance routines and diagnose certain system
malfunctions.
Dial 0 For System Attendant
A user can signal the system attendant station (station 101 at default or any other station set by
programming) by dialing the digit 0 on their personal or group intercom number.
Dial Pulse Interdigit Time
You can set the interdigit time between dial pulses when the system pulse–dials a number over a line.
The DXPPlusdefaults this time to 200 milliseconds and provides a range of timing values in 100
millisecond intervals between 100 milliseconds and one second.
Dial Pulse Rate—Make / Break Ratio
You can set the line make / break ratio for rotary dial signaling in a more flexible manner. You can
program the make and break times independently in one millisecond increments to any time from one to
99 milliseconds.
DXP Plus General Description GCA40–130
Understanding The Features – 65 
						

							Dialed Number Identification Service (DNIS)
The DNIS feature allows the DXPPlusto read an inband DTMF digit string sent by a common carrier. It
uses this information to identify the telephone number the caller dialed and appropriately route the call.
DNIS is a service that long distance carriers make available for dial 800 and dial 900 number subscribers
on trunks that use E&M signalling over a E1 network. Also see the discussion titled Automatic Number
Identification (ANI).
Digital Wireless Telephone Support
The DXPPlussupports the operation of the Scout 900MX digital wireless telephone. The Scout 900MX
is a full-featured proprietary multiline telephone consisting of a wireless handset that lets the user roam
about and still make and receive telephone calls.
Direct-in Lines (DIL)
The direct-in lines (DIL) feature provides a line appearance at a dedicated button on one or more
multiline telephones. The programmer can assign a DIL to a proprietary single-line telephone where it
provides one-way (either incoming or outgoing) or two-way operation depending upon further
programming action.
Direct Inward Dialing (DID)
DID Hunting
When a DID call rings at a station that the programmer has disabled though programming action, the
system routes the call through the disabled station’s hunt list until it locates a group intercom for the call
to ring. Should all group intercoms be busy or should no one answer the call in a programmed number of
rings, the system then routes the call along the station’s call forwarding arrangement. With a hunt list
containing up to eight assigned group intercoms and access to each group intercom available to several
system stations, many users have an opportunity to service a DID caller. Coupling this flexibility with the
station’s call forwarding ability, provides many chances for system users to service DID calls. A
programmer could program a hunt list and a call forwarding scheme to an unassigned station and provide
a designated DID termination and routing center. There would be no need to connect a telephone to the
station port to use the feature in this manner. The programmer could arrange several DID termination
centers to service different DID numbers. Each DID number could represent different calling categories,
and ring at different blocks of system stations (seeMultipurpose Line Boardfor more information).
Direct Inward System Access (DISA)
DISA is a DXPPlusenhancement option that allows outside callers to directly call a station or access
certain internal system features, including all line groups and ARS. The system allows up to eight DISA
lines to be active at the same time. To prevent fraudulent access and unauthorized use, the caller must use
an authorization code and system access code to gain access to outside lines as well as many of the
advanced telephone features. The authorization and access codes are from one to six digits (including
pauses). You can use any of the digits zero through nine.
The system denies access, and routes a DISA call to a pre-programmed device such as a station telephone,
or proprietary voice mail, under the conditions listed below:
a caller dialing an invalid authorization code,
a caller dialing restricted or invalid features,
Comdial has taken reasonable steps in the design of all product features, including DISA, which protect
against unauthorized or fraudulent access to, or use of, a system, or which protect against unauthorized,
fraudulent or unaccounted-for access to, or use of, long distance lines. However, no system is entirely
GCA40–130 DXP Plus General Description
66 – Understanding The Features 
						

							invulnerable or immune from unauthorized or fraudulent access or use, or unaccounted-for access or use,
and therefore Comdial disclaims any and all liability, and makes no warranty, express or implied, relating
to unauthorized or fraudulent access or use, or unaccounted-for access or use.
NOTE: Comdial engineers do not recommend DISA for use on loop start lines without disconnect supervision.
While DISA will function, Comdial will not be liable for its performance under any condition where
disconnect supervision is not provided.
NOTE: Callers that use DISA to access a trunk group and place calls (trunk to trunk calling) may experience low
audio levels on their calls due to the normal line resistance of CO lines. A low audio level is usually only
noticeable on long line loops. If signal loss is a problem at a particular site, the installer may need to add a
line amplifier (repeater) in the DISA line.
In regard to the above note, software release 3A adds +3dB of gain to the DISA lines as a default setting,
and provides a means for the programmer to disable this gain if necessary. The software enhancement
also provides a means by which DISA callers can pre select the gain on a DISA line before they select the
line for use. They can dial a code to select either 0dB, +3dB, or +6dB of gain.
It is important to note that uncompensated line–to–line DISA connections often exhibit low audio levels
due todouble loopcopper losses. While adding gain to these connections will sometimes improve audio
signal levels, the added gain may also result in circuit instability in some connections. This instability
presents itself as asingingsound that can interfere with dialing or voice communications. If callers
experience dialing problems or hear asingingsound in their calls, they should select a lower gain setting
for use.
How DISA Functions
Caller Dials
DISA Number
Caller Hears DISA Tone
or DVA Message
Intercom
Station Rings
Caller Dials
Correct Access
NumberCaller Dials
Incorrect
Access NumberSystem Disconnects
Caller or Provides
Call Routing
Caller Dials
Authorization
Code
Caller Dials
Correct CodeCaller Dials
Incorrect Code
Caller Dials
Intercom
NumberCaller Dials
DISA Access
Number
Caller Accesses Features
Available To Associated
Station Class Of ServiceSystem Returns
Authorization Tone
System Allows Caller To Dial Code Twice More.
After Third Incorrect Number, System Disconnects Caller.
DXP Plus General Description GCA40–130
Understanding The Features – 67 
						

							Direct Line Access By Station
Through program assignment, the system gives certain stations direct access to lines.  The programmer
must map line buttons for use at these stations. The users then press the line buttons to select lines for use.
Direct Line Group Selection
This feature allows the programmer to put lines into line groups. A line group appears to the station user
as a single button. The system supports a maximum of 16 line groups with a line group containing any
number of lines; however, all lines in a group must be the same type. A multiline telephone can have a
line group button for each line group. A single-line proprietary telephone is either dedicated to a specific
line group, or it’s user may dial a code to access a line group.
When a user presses an idle line group button or dials a line group access code, the system scans the lines
in that group and picks the first available line in a reverse hunt group. The indicator associated with the
line group button on multiline telephones is idle if at least one line in the group is idle.
Disconnect Supervision
When the programmer enables this feature for a line, the system detects any break in loop current anytime
during a call and disconnects the line. Also refer to the discussion titled, Abandoned Hold Release.
Discriminating Ringing
The system provides two types of ringing to give an audible distinction between internal and external
calls. Internal calls sound two quick bursts every four seconds and external calls sound one long burst
every four seconds, except when synchronized ringing is enabled. When synchronized ringing is enabled,
the central office ringing pattern is tracked on external calls. Incoming calls transferred by an attendant
always ring as an external call.
Do Not Disturb (DND)
Users can set any multiline telephone to a do not disturb mode (DND) using the designated programmable
button. The associated indicator turns on as an indication of active DNDPlusan appropriate message
appears in the display of LCD speakerphones. Under the DND condition, an outside call forwards to
another station or to the attendant according to the call forwarding feature. An intercom number call will
not ring a DND station and the system sends a fast busy signal to the caller to distinguish from a standard
busy line. No paging announcements are received on the DND station. Even though a station is in the
DND mode, the user can make out-going calls and access other features.
You can set any multiline telephone to a do not disturb mode using the designated programmable button.
The associated indicator turns on as an indication of active DNDPlusan appropriate message appears in
the display of LCD speakerphones. Under the DND condition, an outside call forwards to another station
or to the attendant according to the call forwarding feature. An intercom number call doesn’t ring a DND
station and the system sends a fast busy signal to the caller to distinguish the DND condition from a
standard busy line. No paging announcements are received on the DND station. Even though a station is
in the DND mode, you can still make outgoing calls and access other features.
You can enable or disable this feature on an industry-standard telephone by dialing the feature code
(default is #01).
GCA40–130 DXP Plus General Description
68 – Understanding The Features