RTX 725 Series Parts list manual

RTX 725x Headsets
system guide
Technical Reference Document
Version 2.0
© May-2023 RTX A/S, Denmark

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Trademarks
RTX and the combinations of its logo thereof are trademarks of RTX A/S, Denmark.
Other product names used in this publication are for identification purposes and may be the trademarks of
their respective companies.
Disclaimer
The contents of this document are provided about RTX products. RTX makes no representations with
respect to completeness or accuracy of the contents of this publication and reserves the right to make
changes to product descriptions, usage, etc., at any time without notice. No license, whether express,
implied, to any intellectual property rights are granted by this publication.
Confidentiality
This document should be regarded as confidential, unauthorized copying is not allowed.
© May-2023 RTX A/S, Denmark, All rights reserved
http://www.rtx.dk

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Contents
Contents ...............................................................................................................................................................................3
1About This Document...................................................................................................................................................6
1.1 Audience.............................................................................................................................................................6
1.2 When should I read this guide?..........................................................................................................................6
1.3 Content summary ...............................................................................................................................................6
1.4 Limitations ..........................................................................................................................................................7
1.5 Abbreviations......................................................................................................................................................7
1.6 References/Related Documentation..................................................................................................................7
1.7 Document History...............................................................................................................................................7
1.8 What is new? ......................................................................................................................................................7
1.9 Documentation Feedback...................................................................................................................................7
2Package overview.........................................................................................................................................................8
2.1 Content ...............................................................................................................................................................8
2.2 Damage inspection .............................................................................................................................................8
3System overview ..........................................................................................................................................................9
3.1 Soft client support ..............................................................................................................................................9
3.2 Handover to VoIP multicell systems.................................................................................................................10
3.3 RTX3741 Dongle................................................................................................................................................10
4RTX725x wireless DECT headset overview.................................................................................................................12
4.1 Type of RTX725x headsets................................................................................................................................12
4.2 Headsets overview............................................................................................................................................13
4.3 Physical buttons................................................................................................................................................15
4.4 LED overview ....................................................................................................................................................15
4.4.1 LED patterns.................................................................................................................................................15
4.4.2 LED indication...............................................................................................................................................15
4.5 Battery ..............................................................................................................................................................16
5RTX745x base station overview .................................................................................................................................18
5.1 Base station overview.......................................................................................................................................18
5.2 Spare battery charging .....................................................................................................................................19
6RTX3741 DECT dongle overview ................................................................................................................................20
6.1 RTX3741 Dongle overview................................................................................................................................20
6.2 Dual functionality .............................................................................................................................................20
6.3 LED Patterns......................................................................................................................................................21
6.4 LED Indication...................................................................................................................................................21
6.5 Key Configuration / User Interface...................................................................................................................21

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6.6 Factory Reset ....................................................................................................................................................21
7How to connect headset and base station.................................................................................................................22
7.1 Bluetooth registration ......................................................................................................................................23
7.2 Connect RTX725x headset to PC/Laptop using RTX3741 Dongle.....................................................................23
7.2.1 Deregister RTX725x Headset from RTX3741 Dongle ...................................................................................23
7.3 Hybrid functionality..................................................................................................................................................23
8RTX725x Operations...................................................................................................................................................24
8.1 Controls.............................................................................................................................................................24
8.1.1 Incoming call ................................................................................................................................................24
8.1.2 Secondary call...............................................................................................................................................24
8.1.3 Microsoft Teams integration........................................................................................................................25
8.1.4 Terminating call............................................................................................................................................25
9RTX745x user interface ..............................................................................................................................................26
9.1 Top area items..................................................................................................................................................26
9.1.1 Signal level....................................................................................................................................................26
9.1.2 VoIP ..............................................................................................................................................................27
9.1.3 PC-USB status ...............................................................................................................................................27
9.1.4 Battery status ...............................................................................................................................................27
9.1.5 Other icons...................................................................................................................................................28
9.2 Main area items................................................................................................................................................28
9.2.1 Music control................................................................................................................................................28
9.2.2 Other icons...................................................................................................................................................28
9.3 DECT registration status interface....................................................................................................................29
9.4 Settings Menu...................................................................................................................................................29
9.4.1 General.........................................................................................................................................................30
9.4.2 Audio ............................................................................................................................................................31
9.4.3 Audio Prompt ...............................................................................................................................................32
9.4.4 Registrations.................................................................................................................................................32
9.4.5 Adjust time ...................................................................................................................................................32
9.4.6 VoIP System..................................................................................................................................................32
9.4.7 Reset User Setting........................................................................................................................................33
9.4.8 Factory Reset................................................................................................................................................33
9.5 Call activity on base ..........................................................................................................................................33
9.6 Incoming call.....................................................................................................................................................33
9.7 Active call..........................................................................................................................................................34
9.8 On-hold call.......................................................................................................................................................34
9.9 Multiple calls.....................................................................................................................................................34

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9.10 Multiple line......................................................................................................................................................35
9.11 Active & Inactive line........................................................................................................................................35
9.12 Call termination ................................................................................................................................................35
9.13 Line swapping ...................................................................................................................................................36
9.14 Microphone muting..........................................................................................................................................36
9.15 Volume control .................................................................................................................................................36
10 RTX745x feature description.................................................................................................................................37
10.1 Soft client support ............................................................................................................................................37
10.2 EHS interface ....................................................................................................................................................37
10.3 Ringer configuration .........................................................................................................................................37
11 RTX3741 DECT Dongle features ............................................................................................................................38
11.1 Conference........................................................................................................................................................38
11.2 Soft Client Support............................................................................................................................................38
12 Appendix A (RTX725x Features)............................................................................................................................39
13 Appendix B (RTX745x features) ............................................................................................................................41
13.1.1 Base features ...........................................................................................................................................43
14 Register devices on RTX VoIP system. ..................................................................................................................44
14.1 Register RTX745x headset base........................................................................................................................44
14.2 Register RTX725x headsets...............................................................................................................................46
15 15. Appendix C: EHS and DHSG API ......................................................................................................................47
15.1 EHS Interface ....................................................................................................................................................47
15.1.1 EHS...........................................................................................................................................................47
15.1.2 Phone.......................................................................................................................................................47
15.1.3 DHSG ........................................................................................................................................................47
15.2 EHS Standards...................................................................................................................................................48
15.2.1 DHSG ........................................................................................................................................................48
15.2.2 EA40.........................................................................................................................................................48
16 Appendix D: Call Control Action and Call State Table between BT and DECT......................................................49

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1About This Document
This document describes the configuration, management, operation and maintenance of the RTX725x
headset series which are part of the DECT system range. For customer specific modes, please refer to specific
customer agreements.
1.1 Audience
This guide is intended for everyday users. Furthermore, network administrators, IT support and anyone who
wishes to gain knowledge on the fundamental features of the RTX725x headset series can also benefit from
this material.
1.2 When should I read this guide?
Read this guide before you install the devices and before setting up the DECT connection.
This manual will enable you to set up components in your network to communicate with each other and
deploy a fully functional system.
1.3 Content summary
WHERE IS IT?
CONTENT
PURPOSE
CHAPTER 2
Package overview
Presents the package content and handling
CHAPTER 3
System overview
Provides an overview of how the RTX725x
communicates in the system
CHAPTER 4
RTX725x wireless DECT
headset overview
Provides information on the device specifications and
hardware.
CHAPTER 5
RTX745x base station
overview
CHAPTER 6
RTX3741 DECT dongle
overview
CHAPTER 7
How to connect headset and
base station
A guide on how to connect the two devices
CHAPTER 8
RTX725x Operations
Provides details on headset button controls and call
controls and operations
CHAPTER 9
RTX745x user interface
Provides details on the display, icons, and overall user
interface on the base
CHAPTER 10
RTX745x feature description
Presents general features.
CHAPTER 11
RTX3741 DECT dongle
features
CHAPTER 12
Appendix A (RTX725x
features)
Provides a descriptive list of the supported features
CHAPTER 13
Appendix B (RTX745x
features)
CHAPTER 14
Register devices on RTX VoIP
system
Presents a step-by-step guide on how to register the
RTX745x and RTX725x to the VoIP system
CHAPTER 15
Appendix C (EHS and DHSG
API)
Provides details on EHS and DHSG API
CHAPTER 16
Appendix D (Call Control
Action and Call State Table
between BT and DECT)
Provides information on the call controls when both BT
and DECT connections are active.

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1.4 Limitations
Since the RTX725x series covers 3 different headsets, one of them (RTX7251) will not be covered in detail in
this document. However, in general, it follows the same specification as the RTX7252. More details about the
different headsets can be seen in the beginning of the document.
Furthermore, the paper is not intended as a comprehensive reference to details and specific steps on how to
configure other vendor specific components/devices. For such a reference to vendor specific devices, please
contact the respective vendor for documentation.
1.5 Abbreviations
For this document, the following abbreviations hold:
DECT: Digital Enhanced Cordless Telecommunications
MWI: Message Waiting Indicator
PCBA: PCB Assembled
MFB: Multi-Function Button
BT: Bluetooth
1.6 References/Related Documentation
PC tool
VoIP System guide
1.7 Document History
REVISION
AUTHOR
ISSUE DATE
COMMENTS
1.0
HDJ
30-12-2021
New document
2.0
LIP
27-04-2023
Updated document to match software version 99.13
1.8 What is new?
What new features have been added.
VERSION
Updated descriptions
1.0
New Document
2.0
Updated descriptions on 4.3. Physical buttons on headset.
7.3 Hybrid functionality
8. RTX725x Operations
9.4 Settings menu on RTX745x
Updated operating conditions and charge stop temperature in 13. Appendix B
15.EHS&DHSG API
16. Appendix D: Call Control Action and Call State Table between BT and DECT
1.9 Documentation Feedback
We always strive to produce the best and we also value your comments and suggestions about our
documentation. If you have any comments about this guide, please enter them through the Feedback link on
the RTX website. We will use your feedback to improve the documentation.

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2Package overview
Prior to opening, examine the shipping package for evidence of physical damage. If there is proof of
mishandling prior to opening, you must report it to the relevant support center of the regional representative
or operator.
2.1 Content
The headsets are sold both as a standalone product and together with the base in combined packaging. In
general, every shipped headset unit box contains the below items. If sold together with the base, then the
below add-ons will take part of the package. Make sure all relevant components are available in the package
before proceeding to the next step.
•1x headset
•1x USB C cable
•1x 600mAH Li-polymer battery
•1x 1-page A5 double side B/W print
+
•1x base station (charger)
•1x PSU fixed
Customer specific changes may occur.
NOTE: RTX3741 DECT Dongle is sold separately
2.2 Damage inspection
The following steps are recommended to be followed for damage inspection:
1. Examine all relevant components for damage.
2. Make a “defective on arrival - DOA” report or RMA to the operator. Do not move the shipping carton
until it has been examined by the operator. The operator/regional representative will initiate the
necessary procedure to process this RMA. They will guide the network administrator on how to
return the damaged package if necessary.
3. If no damage is found, then unwrap all the components and dispose of empty package/carton(s) in
accordance with country specific environmental regulations.

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3System overview
The Wireless headset system consists of three main products. RTX745x DECT Base Station, RTX725x DECT
Headset(s) (refer to 11. Appendix A for different models) and RTX3741 DECT Dongle.
The high-end headsets support DECT and BT technology to establish connection with other devices. They are
used with the RTX745x DECT base and Desk Phone / PC / Laptop/ mobile phones. The selected microphone
is balanced together with the headset filters to reduce the background noise to provide an ultimate
understandable and clear speech. On the other hand, the receivers are balanced to the receiver housing and
cushion, so the headset will provide the user an excellent stereo experience.
The figure below (Fig.1) illustrates the high-level description of the system. It provides the basic
understanding of the environment in which the device needs to interact. Both communication possibilities
of the RTX725x are presented in the drawing below and further defined in the following sections.
Fig.1 System overview
3.1 Soft client support
The RTX745x base provides support for various soft clients and thus, it can be used with both PC Windows
and MacOS. This means that, the base combined with one of the RTX725x headsets, supports the audio and
USB API of the applications, such as:
•Microsoft Teams
•Customer client support implemented in PC tool
Respectively, if the headset is used in standalone mode over a Bluetooth connection, the audio of the same
applications (and more) will be supported. In addition to this, the devices can also be used as generic USB
headsets for general audio.

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3.2 Handover to VoIP multicell systems
The RTX725x headset and RTX745x base can be integrated together into VoIP multicell and dual cell systems.
The headset base will register on behalf of itself and the headset. The two registrations are independent but
will be linked logically as one unit on the VoIP system. The purpose of this integration is to hand over the
user’s calls to the VoIP system for the user to be flexible in terms of location (Fig.2).
Fig.2 Call Handover
3.3 RTX3741 Dongle
The RTX725x headset can be used with the RTX3741 dongle, which will serve as a base station. This is
convenient for users who want to use the headset remotely, for example in home office or on the road where
it is not possible to bring the base station (Fig.3). The dongle is supported by both Windows and MacOS.
PC Tool DECT Dongle RTX725x DECT
Headset
Fig.3 Headset connection via RTX3741 DECT Dongle

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RTX3741 also offers desk phone support (Fig.4).
Deskphone DECT Dongle RTX725x DECT
Headset
Fig.4 Headset connection to Desk phone
NOTE: RTX will provide USB API. The customer is responsible for implementing it on relevant phones.
It is also possible to connect a Desk phone to an existing RTX DECT system using the RTX3741 Dongle (Fig.5)
Deskphone DECT Dongle
RTX DECT Infrastructure
Fig.5 Connect Desk phone to DECT network.
NOTE: RTX will provide USB API. The customer is responsible for implementing it on relevant phones.

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4RTX725x wireless DECT headset overview
The RTX725x series are wireless DECT+BT headsets. As mentioned before, the headset connects to the DECT
base, which act as a charger for the headset, via the DECT wireless technology. It can also connect via
Bluetooth to supported devices, such as mobile phones and Bluetooth compatible desk phones.
A Busy-light indicator on the headband is used to indicate that the user is busy. The headset also features
Environmental Noise Cancellation (ENC) to suppress unwanted environmental noise for the microphone
input and Active Noise Cancellation (ANC) to suppress the noise towards the user. The headset offers DSP
assisted echo cancelling. The length of the headband is adjustable to suit the head-shape of different users
and the tilting angle of the boom can be adjusted to fit the position of the mouth of different people.
The DECT base/charger connects to the PC/laptop. It can access Microsoft Teams and a defined range of soft
call clients from external vendors, as well as a defined range of desk phones via EHS interface. Call control
can be managed via the base, attached desk phones, soft call clients on the PC or via the buttons on the left
earcup of the headset. A conferencing feature allows up to 4 headsets to connect to the same base –users
may be added / removed from the conferencing call on the fly.
The primary application of the RTX725x is within call centers and office environments allowing the user to
access the internet/VoIP calls and music playback via the PC/BT.
4.1 Type of RTX725x headsets
The headset auto-configures the DECT setup when connecting to the base, thus no country specific variants
exist. As mentioned earlier, the RTX725x series covers 3 different headsets: (For more detailed features
overview, refer to 11. Appendix A)
Model
Product
Country Variant
RTX7251
DECT Mono high-end
Headset
World wide
(Taiwan, EMEA, Brazil & Uruguay, LATAM, Argentina,
Chile, USA, Canada)
RTX7252
DECT Stereo High-end
Headset
World wide
(Taiwan, EMEA, Brazil & Uruguay, LATAM, Argentina,
Chile, USA, Canada)
RTX7254
DECT Stereo High-end
Headset ANC
World wide
(Taiwan, EMEA, Brazil & Uruguay, LATAM, Argentina,
Chile, USA, Canada)

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4.2 Headsets overview
The following section aims to provide an overview of the headsets, including the available buttons and LED’s.
All models have an LED on the boom arm indicating if the user is busy (Fig.6).
Fig.6 Headset boom arm LED
Headset can be adjusted on both sides of the headband for a perfect fit (Fig.7).
Fig.7 Headband adjustability

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The headset has 7 different control buttons (Fig.8).
Fig.8 Buttons and user interface.
The images below represent the styling of the headsets from the RTX725x series (Fig.9). The product is
available in 3 different colors –grey, black and white. The cushions of the headsets are removable and
replaceable to improve the comfort of the users.
There are two types of ear cushions –on-ear and over-the-ear (Fig.9). RTX7254 supports both types of ear
cushions. A sensor in the headset detects which type of cushion is used and adapts the audio tuning
accordingly to get the optimal noise reduction. The other two devices (RTX7251 and RTX7252) only support
the on-ear cushion solution.
Fig.9 Styles and ear Cushions

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4.3 Physical buttons
The headset is operated using the buttons on the earcup with boom arm. The ANC button is located on the
opposite earcup, as ANC is not available for Mono headsets (Fig.8)
The following table represents the functions of the buttons seen on the figures above
INPUT
FUNCTIONS
POWER SLIDER
Power the headset on and off
SCROLL WHEEL WITH AN
INTEGRATED KEY
Increase volume
Decrease volume
MULTI-FUNCTION BUTTON
Answer call
End call
Reject call
Trigger AI voice assistant
Microsoft Teams button
Hold/Swap/Retrieve Call
Leave conference during call
MUTE KEY
Toggle mute
Play/Pause music
Skip to next track (double click)
Announce battery level (press and hold)
DECT KEY
Enter DECT pairing mode
Reset settings (press and hold)
De-register 2nd headset during Idle
BT KEY
Toggle Bluetooth
Enter Bluetooth pairing mode
ANC KEY
Toggle ANC
For more details on the RTX725X headset controls refer to 8.1. Controls.
4.4 LED overview
The headset has a single tricolor LED on the tip of the boom-arm, which is a combination of 3 LEDs –red,
green, and blue. All visual indications are disabled if “eco mode” is enabled.
4.4.1 LED patterns
The LED supports 3 different kinds of patterns. The definitions of each pattern can be seen in the table below:
LED PATTERN
DEFINITION
BLINK
ON-OFF
BREATHING
One color that slowly becomes brighter until it reaches full brightness and
then dimmers until fully dimmed. It is a repeated cycle.
ALTERNATING
Alternating between two colors
4.4.2 LED indication
The table below presents the LED indication depending on the status of the headset.
FUNCTION
STATUS LED COLOR PATTERN
SYSTEM
Reset setting started
White
Blink 3 times

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BLUETOOTH REGISTRATION
Registration, In
progress
Blue, red
Alternating
Registration, Success
Green
Blink 3 times
Registration, Failed
Red
Blink 3 times
DECT REGISTRATION
Registration, In
progress
Blue, red
Alternating
Registration, Success
Green
Blink 3 times
Registration, Failed
Red
Blink 3 times
BATTERY STATUS
No battery*
Cyan
Blink
Fully charged*
Green
ON
Charging
Green
Breathing
Low
Red
Blink
BUSY MODE
Busy enabled or call
active
Red
Breathing
TEAMS NOTIFICATIONS
Meeting, voicemails or
missed calls
Purple
Breathing
* If headset is turned off during charging the LED is off as well.
4.5 Battery
The headsets use 600mAH Li-polymer battery, which is easily replaceable after removing the battery lid, as
illustrated on the image below (Fig.10).,
NOTE: Make sure to remove the plastic foil protecting the battery, upon powering your new headset.
Fig.10 Battery lid removed.

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The RTX725x can be charged in 2 ways. One of the options is placing the headset in the cradle of the base,
which displays the charging status. Another way to charge the device can be with the use of a USB cable,
where the status will be shown on the boom-arm LED. For more details about the battery LED indications,
please refer to the previous section 4.4.2 LED indication. The battery performance can be seen in the
summary table of features in section 12. Appendix B.

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5RTX745x base station overview
The RTX745x device is an EHS/USB wireless base station which provides USB connectivity to
PC/laptop/desktop phone and DECT connectivity to RTX725x headsets. It is designed as a Plug & Play
solution, meaning that no additional driver installations are needed.
The figure below (Fig.11) illustrates the high-level description of the communication possibilities of the
device. The RTX745x base is connected to a host (PC or desktop phone) with USB interface. It acts as a DECT
base station for the RTX725x headset.
Fig.11 Device connections
The RTX745x serves as a base and charger for the RTX725x series headsets. The primary application is within
call centers and office environments allowing the user to access internet/VoIP calls, music playback via the
PC/mobile phone, and desk phone connectivity.
5.1 Base station overview
The base includes a 2.4-inch 240x320 TFT display for status and configuration. Furthermore, it has 3 keys for
call control handling (hook off, hook on and mute), a clickable scroll-wheel and a key for easy menu navigation
(Fig.12).
Fig.12 RTX745x front view

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Further details on the functionality of the keys can be seen on the table below:
INPUT
FUNCTIONALITY
HOOK OFF
Answer call (short press)
Swap between calls (short press)
Swap between lines (double press)
Hold/Retrieve call (short press)
Hold active call and accept incoming call (long press)
HOOK ON
End call
Reject call
MUTE
Toggle mute
BACK KEY
Return to the parent menu of the current submenu
Leave the settings men
SCROLL WHEEL
Open the settings menu
Select an item in the settings menu
Scroll to the next item in the settings menu
Scroll to the previous item in the settings menu
Adjust earphone volume
The base station provides both EHS and DHSG connectivity on the back side of the unit. For further details on the
EHS/DHSG see 9.2 and Chapter 15: Appendix C.
Fig.12 RTX745x back view
5.2 Spare battery charging
The base also includes a separate charger for a spare battery. The battery is placed on the back of the base,
as shown below (Fig.13).
Fig.13 Spare battery charging.

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6RTX3741 DECT dongle overview
The RTX3741 is a USB type A dongle with slide switch that can establish a wireless connection with the RTX
headsets from the RTX725x series. The dongle supports dual mode, meaning that it can be used either as a
Fixed part (FP), or Portable part (PP).
-Base / FP mode:
oActs as a DECT base for the RTX725x headsets.
-Headset / PP part:
oEnables DECT access for a USB desktop phone on the RTX VoIP system.
Since the DECT dongle can run one mode at a time, you can switch between the two functionalities by using
the slider switch.
The device is designed to be easy to use with a desk phone/PC/laptop with very good sound quality. Since
the device uses DECT technology, it can remember 4 registrations –one primary and three secondaries. The
audio can be directed to the headset, depending on the user’s choice. When the headset is connected via
the RTX3741 DECT Dongle to a PC, the user may access calls from Soft Call Clients, such as Microsoft Teams.
Support for other call clients is available and requires that the PC Setup tool isinstalled on the used laptop/PC.
6.1 RTX3741 Dongle overview
The RTX3741 dongle has one button, one slider switch and 3 LED’s (Fig.14)
Fig.14 Dongle overview
6.2 Dual functionality
The RTX3741 is a dual-mode device in a shared hardware. This means that the user can switch between the
functionalities by using the slider switch. Firmware updates and configuration are managed via the PC Setup
tool. The table below presents the differences between the 2 modes.
DIFFERENT MODES
FUNCTIONALITY
Base Station (Fixed Part)
Acts as DECT base for the RTX725x headsets;
Slider is placed at the bottom (towards the USB connector);