Grandstream Networks DP750 User manual

Grandstream Networks, Inc.
DP750/DP720
DECT Cordless IP Phones
User Guide

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DP750/DP720 User Guide
COPYRIGHT
©2017 Grandstream Networks, Inc. http://www.grandstream.com
All rights reserved. Information in this document is subject to change without notice. Reproduction or
transmittal of the entire or any part, in any form or by any means, electronic or print, for any purpose without
the express written permission of Grandstream Networks, Inc. is not permitted.
The latest electronic version of this user manual is available for download here:
http://www.grandstream.com/support
Grandstream is a registered trademark and Grandstream logo is trademark of Grandstream Networks, Inc. in
the United States, Europe and other countries.
CAUTION
Changes or modifications to this product not expressly approved by Grandstream, or operation of this
product in any way other than as detailed by this User Manual, could void your manufacturer warranty.
WARNING
Please do not use a different power adaptor with your devices as it may cause damage to the products and
void the manufacturer warranty.

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DP750/DP720 User Guide
GNU GPL INFORMATION
DP750 firmware contains third-party software licensed under the GNU General Public License (GPL).
Grandstream uses software under the specific terms of the GPL. Please see the GNU General Public
License (GPL) for the exact terms and conditions of the license.
Grandstream GNU GPL related source code can be downloaded from Grandstream web site from:
http://www.grandstream.com/support/faq/gnu-general-public-license/gnu-gpl-information-download

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DP750/DP720 User Guide
Table of Content
DOCUMENT PURPOSE....................................................................................................9
CHANGE LOG.................................................................................................................10
Firmware Version 1.0.3.23......................................................................................................................10
Firmware Version 1.0.2.16......................................................................................................................10
Firmware Version 1.0.1.14......................................................................................................................10
Firmware Version 1.0.1.4........................................................................................................................ 11
Firmware Version 1.0.0.16...................................................................................................................... 11
GUI INTERFACE EXAMPLES.........................................................................................12
WELCOME ......................................................................................................................13
PRODUCT OVERVIEW ...................................................................................................14
Feature Highlights...................................................................................................................................14
DP750 Technical Specifications..............................................................................................................14
DP720 Technical Specifications..............................................................................................................16
GETTING STARTED........................................................................................................18
Equipment Packaging.............................................................................................................................18
Connecting DP750..................................................................................................................................19
Connecting via AC power ................................................................................................................ 19
Connecting via PoE......................................................................................................................... 20
Setting up DP720 handset......................................................................................................................20
Battery Information .......................................................................................................................... 20
Setting up the Charge Station.................................................................................................................21
DP750 LED Patterns...............................................................................................................................21
DP720 Handset Description ...................................................................................................................22
DP720 Icons Description ........................................................................................................................23
DP720 Handset Menu.............................................................................................................................25
BASIC OPERATIONS......................................................................................................28

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DP750/DP720 User Guide
Turning the Handset ON / OFF............................................................................................................... 28
Setup Wizard ..........................................................................................................................................28
Register DP720 Handset to DP750 Base Station ..................................................................................28
Using DP720 with Multiple DP750 Base Stations ..................................................................................29
Registering DP720 to an additional DP750 base station ................................................................ 29
Switching Between Different Base Stations .................................................................................... 30
Unregister the DP720 ............................................................................................................................. 31
Obtain DP750 Base Station IP Address via paired DP720.....................................................................32
Setting the Key Lock...............................................................................................................................32
Locating a DP720 Handset from DP750 Base station............................................................................33
Locate via DP750 Web UI ............................................................................................................... 33
Locate via DP750 Base station ....................................................................................................... 34
Checking System Status.........................................................................................................................34
Basic Network Settings...........................................................................................................................34
Change Menu and LCD Timeout............................................................................................................35
Return to Idle Screen.............................................................................................................................. 36
Register a SIP Account...........................................................................................................................36
Register account via web user interface ......................................................................................... 36
PHONE SETTINGS..........................................................................................................39
Editing the Handset’s name....................................................................................................................39
Changing the Base PIN Code................................................................................................................. 40
Selecting Phone Language.....................................................................................................................42
Activate/Deactivate Hands-Free Mode...................................................................................................42
Muting the Microphone ........................................................................................................................... 43
Adjusting Speaker and Earpiece Volume ...............................................................................................43
Ringtones................................................................................................................................................43
Setting the Ringer Volume on the Handset ..................................................................................... 43
Setting the Ringer Melody on the Handset...................................................................................... 44
Advisory Tones ................................................................................................................................ 45
Ringtones Customization................................................................................................................. 45

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DP750/DP720 User Guide
Date and Time.........................................................................................................................................49
Outgoing Default Line.............................................................................................................................49
Factory Functions ...................................................................................................................................50
DP720 Handset Firmware Upgrade........................................................................................................ 51
Reboot DP750 Base Station...................................................................................................................51
Reset DP720 Handset............................................................................................................................ 52
CALL OPERATIONS .......................................................................................................53
Placing calls............................................................................................................................................53
Make a Call using a Line ................................................................................................................. 53
Dialing from Call history................................................................................................................... 54
Dialing from Phonebook .................................................................................................................. 54
Answering Calls ......................................................................................................................................55
Auto Answer..................................................................................................................................... 55
Off-Cradle Pickup ............................................................................................................................ 56
Ending Calls............................................................................................................................................ 56
On-Cradle Hangup........................................................................................................................... 56
Rejecting Calls........................................................................................................................................57
Direct IP Call...........................................................................................................................................57
Call Hold/Resume...................................................................................................................................58
Call Waiting.............................................................................................................................................58
Do Not Disturb ........................................................................................................................................59
Call forward.............................................................................................................................................59
Call transfer.............................................................................................................................................60
Blind Transfer................................................................................................................................... 60
Attended Transfer ............................................................................................................................ 60
Speed Dial ..............................................................................................................................................60
3-Way Conference..................................................................................................................................61
Voice Mail................................................................................................................................................62
Set Voice Mail Feature Code........................................................................................................... 62
Play Voice Mail Messages............................................................................................................... 62

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DP750/DP720 User Guide
Call Features...........................................................................................................................................63
RESTORE FACTORY DEFAULT SETTINGS..................................................................64
EXPERIENCING DP750/DP720 ......................................................................................65

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DP750/DP720 User Guide
Table of Tables
Table 1: DP750 Features at a Glance............................................................................................................14
Table 2: DP720 Features at a Glance............................................................................................................14
Table 3: DP750 Technical Specifications ....................................................................................................... 15
Table 4: DP720 Technical Specifications ....................................................................................................... 16
Table 5: Equipment Packaging ......................................................................................................................18
Table 6: DP750 Led Patterns.........................................................................................................................21
Table 7: Handset Keys Description................................................................................................................22
Table 8: DP720 Icons Description..................................................................................................................23
Table 9: DP720 Info description.....................................................................................................................34
Table 10: Call Features .................................................................................................................................. 63

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DP750/DP720 User Guide
Table of Figures
Figure 1: DP750 Package Content ................................................................................................................18
Figure 2: DP720 Package Content ................................................................................................................18
Figure 3: DP750 Back View...........................................................................................................................19
Figure 4: Connecting the Base station...........................................................................................................19
Figure 5: Setting up the DP720......................................................................................................................20
Figure 6: Setting up the charge station..........................................................................................................21
Figure 7: Handset Keys Description ..............................................................................................................22
Figure 8: DP720 Menu Structure ...................................................................................................................25
Figure 9: DECT Status - Subscribe................................................................................................................ 28
Figure 10: Registration process.....................................................................................................................29
Figure 11: Multiple Base Stations Registration ..............................................................................................30
Figure 12: Switching Between Base Stations ................................................................................................30
Figure 13: Unregister DP720 from DP750 web UI.........................................................................................31
Figure 14: Locate Handset via Web UI..........................................................................................................33
Figure 15: Network Settings configuration.....................................................................................................35
Figure 16: SIP Settings ..................................................................................................................................37
Figure 17: SIP Accounts Settings...................................................................................................................38
Figure 18: Account Status..............................................................................................................................38
Figure 19: Handset Name editing ..................................................................................................................39
Figure 20: Edit Handset Name from DP750 ..................................................................................................40
Figure 21: Changing Admin Base PIN Code from DP720 .............................................................................41
Figure 22: Changing Admin Base PIN Code from DP750 .............................................................................41
Figure 23: Handset Language .......................................................................................................................42
Figure 24: Ringer Volume ..............................................................................................................................44
Figure 25: Calls Ringtones.............................................................................................................................44
Figure 26: Advisory Tone................................................................................................................................45
Figure 27: Generating Custom Ringtone (Windows).....................................................................................46
Figure 28: Downloading Custom Ringtones ..................................................................................................47
Figure 29: Custom Ringtone on DP750.........................................................................................................48
Figure 30: Custom Ringtone on DP720.........................................................................................................48
Figure 31: Date and Time Settings ................................................................................................................ 49
Figure 32: Factory Functions .........................................................................................................................50
Figure 33: New Firmware Available Notification ............................................................................................51
Figure 34: Firmware Upgrade........................................................................................................................ 51
Figure 35: Rebooting the Base Station..........................................................................................................52
Figure 36: Resetting the Base Station ........................................................................................................... 52

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DP750/DP720 User Guide
DOCUMENT PURPOSE
This document describes the basic concept and tasks necessary to use and configure your DP720 via the
LCD menu and also using the DP750 base station. And it covers the handset installation, basic operations
and call features. Please visit http://www.grandstream.com/support to download the latest “DP750/DP720
User Guide”.
This guide covers following topics:
•Product Overview
•Getting Started
•Basic Operations
•Phone settings
•Call Operations
•Restore Factory Default Settings

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DP750/DP720 User Guide
CHANGE LOG
This section documents significant changes from previous versions of user guide for DP750/DP720. Only
major new features or major document updates are listed here. Minor updates for corrections or editing are
not documented here.
Firmware Version 1.0.3.23
•Removed Tools/alarm menu from DP720 GUI, replaced by Status menu. [Status]
•Added keypad tones for non DTMF keys on DP720.
•Added subscribe softkey in idle screen if HS no subscribed on DP720. [Subscribe softkey]
•Added the ability to customize DP720 ringtones. [Ringtones Customization]
•Added DP720 walk through setup wizard after factory reset. [Setup Wizard]
•Added support for more languages and updated translation.
•Added DP720 factory reset combo key to be able to recover the device during booting up. [DP720
factory reset using combo key]
Firmware Version 1.0.2.16
•Re-arranged the Handset Menu Settings. [DP720 Handset Menu]
•Changed menu “Line Status” in Call Settings to “Lines”. [Lines]
•Changed menu “Number” in set voice Mail to “VM Access Number”.
•Added headset detection and icon for DP720 dial mode screen. [DP720 Icons Description]
•Added ability to bridge conference before third party answers. [3-Way Conference]
•Added ability to reboot from DP720 handset. [Reboot DP750 Base Station]
•Improved alarm snooze icon.
•Added DP720 LCD auto turn on feature when pickup from or reposition to charger.
•Added + button support for keypad dialing. [DP720 Handset Description] [Make a Call using a Line]
•Added Serbian, Slovakian languages.
•Improved support for Czech, Dutch, German, Hebrew, Japanese, Korean, Turkish languages
Firmware Version 1.0.1.14
•Added snooze time settings for alarm function.
•Added snooze icon.
•Updated alarm icon.
•Removed IVR (Interactive Voice Response).
•Added contact name to delete confirmation.
•Added use Line from Contacts when dialing out of phonebook. [Dialing from Phonebook]
•Added VM, missed calls, headset icon. [DP720 Icons Description]

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DP750/DP720 User Guide
•Removed “Intercom”feature.
•Removed “Internal Call” from audio ring tone menu.
•Adjusted Call History and Contacts menu architecture. [DP720 Handset Menu]
•Moved "Edit Dial" option to last one in Call History and Contacts menu option. [Dialing from Call
history] [Dialing from Phonebook]
•Hide empty fields when displaying contact info.
•Hide icon after press back key in idle misses call or VM alert screen.
•Moved “Standard ring” to last one of ring tone list. [Ringtones]
•Missed Call can be dialed back via related SIP profile using softkey. [Dialing from Call history]
Firmware Version 1.0.1.4
•Added Call and Delete softkeys during off-hook dial. [Placing calls]
•Added left softkey for Voice mail alert window to enter the Play Message window. [Play Voice Mail
Messages]
•Added Display line name info immediately after off-hook. [Placing calls]
•Changed to only press ESC key to show factory menu.
•Added Dial number immediately after off-hook.
•Added Dialing GUI enhancements.
•Added ability to configure menu key timeout. [Change Menu and LCD Timeout]
•Added Handset will prompt “Saved successfully”if configuring call forward settings in ring group.
•Added advisory tone for handset put in and out of cradle.
•Added ability to configure menu key timeout.
•Added when last name is none use the first name for speed dial record name.
•Added when handset enter IVR, press RSK hold key will delete dial number.
•Added stop dial tone if first key not number key after off hook
Firmware Version 1.0.0.16
•This is the initial version for DP750/DP720.

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DP750/DP720 User Guide
GUI INTERFACE EXAMPLES
http://www.grandstream.com/sites/default/files/Resources/dp750_web_gui.zip
1. Screenshot of Login Page
2. Screenshots of Status Pages
3. Screenshots of Profiles Pages
4. Screenshots of DECT Pages
5. Screenshots of Settings Pages
6. Screenshots of Maintenance Pages
7. Screenshots of Phonebook Pages

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DP750/DP720 User Guide
WELCOME
Thank you for purchasing Grandstream DP750 DECT IP Base Station and DP720 DECT Handset.
The DP750 is a powerful DECT VoIP base station that pairs with up to 5 of Grandstream’s DP720 DECT
handsets to offer mobility to business and residential users. It supports a range of 300 meters outdoors and
50 meters indoors to give users the freedom to move around their work or home space, delivering efficient
flexibility. This DECT VoIP base station supports up to 10 SIP accounts and 5 concurrent calls while also
offering 3-way voice conferencing, full HD audio and integrated PoE. A shared SIP account on all handsets
will add seamless unified features that gives users the ability to answer all calls regardless of location in
real-time. The DP750 supports a variety of auto-provisioning methods and TLS/SRTP/ HTTPS encryption
security. When paired with Grandstream’s DP720, the DP750 offers a powerful DECT VoIP base station that
allows any business or residential user to create a cordless VoIP solution.
The DP720 is a DECT cordless VoIP phone that allows users to mobilize their VoIP network throughout any
business, warehouse, retail store and residential environment. It is supported by Grandstream’s DP750
DECT VoIP base station and delivers a combination of mobility and top-notch telephony performance. Up to
five DP720 handsets are supported on each DP750 while each DP720 supports a range of up to 300 meters
outdoors and 50 meters indoors from the base station. The DP720 touts a suite of top-notch telephony
features including support for up to 10 SIP accounts per handset, full HD audio, a 3.5mm headset jack,
multi-language support, a speakerphone and more. When paired with Grandstream’s DP750 DECT Base
Station, the DP720 offers a powerful DECT VoIP handset that allows any business or residential user to
create a cordless VoIP solution.

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DP750/DP720 User Guide
PRODUCT OVERVIEW
Feature Highlights
The following tables contain the major features of the DP750 / DP720:
Table 1: DP750 Features at a Glance
Table 2: DP720 Features at a Glance
DP750 Technical Specifications
The following table resumes all the technical specifications including the protocols / standards supported,
voice codecs, telephony features, languages and upgrade/provisioning settings for the Base station DP750.
DP750
5 handsets.
10 accounts.
10 lines.
5 concurrent calls.
PoE power support.
300m range outdoor / 50m range indoor.
DP720
DECT cordless HD.
1.8 inch (128x160) TFT color LCD.
250 hours standby / 20 hours talk time.
15 languages embedded.
10 accounts.
10 lines.
5 ring modes.

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DP750/DP720 User Guide
Table 3: DP750 Technical Specifications
Air Interface
Telephony standards: DECT
Frequency bands:
▪1880 –1900 MHz (Europe), 1920 –1930 MHz (US)
▪1910 –1920 MHz (Brazil), 1786 –1792 MHz (Korea)
▪1893 –1906 MHz (Japan), 1880 –1895 MHz (Taiwan)
Number of channels: 10 (Europe), 5 (US, Brazil or Japan), 3 (Korea), 8 (Taiwan)
Range: up to 300 meters outdoor and 50 meters indoor
Peripherals
5 LED indicators: Power, Network, Register, Call, DECT
Reset button, Pairing/Paging button
One 10/100 Mbps auto-sensing Ethernet port with integrated PoE
Protocols/Standards
SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS
(A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE,
LLDP-MED, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6 (pending)
Voice Codecs
G.711µ/a-law, G.723.1, G.729A/B, G.726-32, iLBC, G.722, OPUS,
G.722.2/AMR-WB (special order), in-band and out-of-band DTMF (in audio,
RFC2833, SIP INFO), VAD, CNG, PLC, AJB
Telephony Features
Hold, transfer, forward, 3-way conference, downloadable phonebook (XML, LDAP,
up to 3000 entries), call waiting, call log (up to 300 records), auto answer, flexible
dial plan, music on hold, server redundancy and fail-over
Sample
Applications
Currency (pending)
QoS
Layer 2 QoS (802.1Q, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)
Security
User and administrator level access control, MD5 and MD5-sess based
authentication, 256-bit AES encrypted configuration file, TLS, SRTP, HTTPS,
802.1x media access control, DECT authentication & encryption
Multi-language
English, Czech, German, Spanish, French, Arabic, Hebrew, Italian, Russian,
Netherlands, Japanese, Polish, Chinese Simple, Chinese Tradition, Korean,
Portuguese, Slovakian, Serbian, Turkish.
Upgrade/
Provisioning
Firmware upgrade via TFTP/HTTP/HTTPS, mass provisioning using TR-069 or
AES encrypted XML configuration file
Multiple SIP
Accounts
Up to ten (10) distinct SIP accounts per system
Each handset may map to any SIP account(s)
Each SIP account may map to any handset(s)

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DP750/DP720 User Guide
Ring Group
Flexible options when multiple handsets share the same SIP account
▪Circular Mode: all phones ring sequentially, starting with the phone after
the one which rang last.
▪Linear Mode: all phones ring sequentially in the predetermined order,
starting with the first phone each time.
▪Parallel Mode: all phones ring concurrently; after one phone answers,
the remaining available phones can make new calls
Power & Green
Energy Efficiency
Universal Power Supply Input AC 100-240V 50/60Hz; Output 5VDC, 1A;
Micro-USB connection; PoE: IEEE802.3af Class 1, 0.44W–3.84W
Package Content
Base unit, Universal Power Supply, Ethernet cable, Quick Installation Guide, GPL
Statement
Dimensions
28.5 mm (H) x 130 mm (W) x 90 mm (D)
Weight
Base unit: 143g, Universal Power Supply: 50g; Package: 360g
Temperature
and Humidity
Operation: -10º to 55ºC (14 to 131ºF); Storage: -20º to 60ºC (-4 to 140ºF);
Humidity: 10% to 90% non-condensing
Compliance
FCC: Part 15D, 47 CFR 2.1093, Part 15B
CE: EN60950; EN301489-1-6; EN301406
RCM: AS/NZS60950
ANATEL: #2288-16-9452
DP720 Technical Specifications
The following table resumes all the technical specifications including the protocols / standards supported,
voice codecs, telephony features, languages and upgrade/provisioning settings for the DP720 handset.
Table 4: DP720 Technical Specifications
Air Interface
Telephony standards: DECT
Frequency bands:
▪1880 –1900 MHz (Europe), 1920 –1930 MHz (US)
▪1910 –1920 MHz (Brazil), 1786 –1792 MHz (Korea)
▪1893 –1906 MHz (Japan), 1880 –1895 MHz (Taiwan)
Number of channels: 10 (Europe), 5 (US, Brazil or Japan), 3 (Korea), 8 (Taiwan)
Range: up to 300 meters outdoor and 50 meters indoor
Peripherals
1.8 inch (128x160) color TFT LCD
23 keys including 2 softkeys, 5 navigation / menu keys, 4 dedicated function keys
for SEND, POWER/END, SPEAKERPHONE, MUTE
3-color MWI LED
3.5mm headset jack
Removable belt clip
Micro-USB port for alternative charging and non-battery operation
Protocols/Standards
Hearing Aid Compatibility (HAC) compliant

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DP750/DP720 User Guide
Voice Codecs
G.722 codec for HD audio and G.726 codec for narrow band audio (G.711μ/a-law,
G.723.1, G.729A/B, iLBC and OPUS are supported via companion DECT base
station DP750), AEC, AGC, Ambient noise reduction
Telephony Features
Hold, transfer, forward, 3-way conference, call park, call pickup, downloadable
phonebook, call waiting, call log, auto answer, click-to-dial, flexible dial plan,
music on hold
Sample
Applications
Currency (pending)
HD Audio
Yes, in both Handset and Speakerphone modes
Security
DECT authentication & encryption
Multi-language
English, Czech, German, Spanish, French, Hebrew, Italian, Netherlands,
Japanese, Chinese, Chinese simple, Polish, Russian, Chinese Simple, Chinese
Tradition, Korean, Portuguese, Slovakian, Serbian, Turkish, Arabic.
Upgrade/
Provisioning
Software Upgrade Over-The-Air (SUOTA), handset provisioning Over-The-Air
Multiple Line
Access
Each handset may access up to 10 lines
Power & Green
Energy Efficiency
Universal Power Supply Input AC 100-240V 50/60Hz; Output 5VDC 1A;
Micro-USB connection; Rechargeable 800mAh Ni-MH Low Self-Discharge (LSD)
AAA batteries (250 hours of standby time and 20 hours of talk time)
Package Content
Handset unit, universal power supply, charger cradle, belt clip, 2 batteries, Quick
Installation Guide
Dimensions
(H x W x D)
Handset: 155 x 50 x 26 mm, charger cradle: 35 x 63.5 x 54 mm
Weight
Handset: 138g, charger cradle: 71g, universal power supply: 50g; Package: 360g
Temperature
and Humidity
Operation: -10º to 50ºC (14 to 122ºF); Charging: 0 to 45ºC (32 to 113ºF); Storage:
-20º to 60ºC (-4 to 140ºF); Humidity: 10% to 90% non-condensing
Compliance
FCC: Part 15D; 47 CFR 2.1093 & IEEE1528-2013, Part68, Part 15B
CE: EN60950; EN301489-1-6; EN301406; EN50360; EN62209-1
RCM: AS/NZS60950; AS/ACIF S004
ANATEL: #2288-16-9452

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DP750/DP720 User Guide
GETTING STARTED
This chapter provides basic installation instructions including the list of the packaging contents and also
information for obtaining the best performance with the DP720 IP DECT phone and its base station DP750.
Equipment Packaging
Table 5: Equipment Packaging
Figure 1: DP750 Package Content
Figure 2: DP720 Package Content
DP720
DP750
•1 Handset unit
•1 Universal power supply 5V
•1 Charger cradle
•1 Belt clip
•2 Rechargeable batteries
•1 Quick Installation Guide
•1 Base unit
•1 Universal power supply 5V
•1 Ethernet cable
•1 Quick Installation Guide
•1 GPL Statement
2x Rechargeable
Batteries
1x DP720 Handset
1x Charge Station
1x Quick Installation Guide
1x GPL Statement
1x 5V Power Adapter
1x Handset Belt Clip
1x DP750 Base Station
1x 5V Power Adapter
1x Ethernet Cable
1x Quick Installation Guide
1x GPL Statement

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DP750/DP720 User Guide
Note: Check the package before installation. If you find anything missing, contact your system administrator.
Connecting DP750
To setup the DP750 Base Station, please follow the steps below:
Figure 3: DP750 Back View
You have two options for power and network connection of the base station: AC power or Power over
Ethernet (PoE)
Connecting via AC power
1. Connect the micro-USB connector into the related port on the base station and connect the other
end of the power adapter into an electrical power outlet.
2. Connect the supplied Ethernet cable between the Internet port on the base station and the Internet
port in your network or the switch/hub device port.
Figure 4: Connecting the Base station
Reset Button
Power Input
Radio / Page Button
Network Socket