Grandstream Networks GAC2500 User manual

Grandstream Networks, Inc.
GAC2500 Audio Conference Phone for AndroidTM
User Guide

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GAC2500 User Guide
Index
CHANGE LOG..............................................................................................................................................................9
FIRMWARE VERSION 1.0.1.34........................................................................................................................ 9
FIRMWARE VERSION 1.0.1.26........................................................................................................................ 9
FIRMWARE VERSION 1.0.1.18........................................................................................................................ 9
FIRMWARE VERSION 1.0.1.6.......................................................................................................................... 9
WELCOME..................................................................................................................................................................10
PRODUCT OVERVIEW............................................................................................................................................ 11
FEATURE HIGHTLIGHTS................................................................................................................................ 13
SAFETY COMPLIANCES.................................................................................................................................14
WARRANTY........................................................................................................................................................14
INSTALLING GAC2500.............................................................................................................................................14
EQUIPMENT PACKAGE CONTENT.............................................................................................................. 15
PRODUCT APPEARANCE.............................................................................................................................. 15
CONNECTING GAC2500.................................................................................................................................16
IP MODE..................................................................................................................................................... 17
USB SLAVE MODE................................................................................................................................... 18
CASCADE MODE......................................................................................................................................18
MOBILE PHONE MODE...........................................................................................................................19
GETTING TO KNOW GAC2500..............................................................................................................................20
DESKTOP........................................................................................................................................................... 21
STATUS ICONS................................................................................................................................................. 21
USING THE ONSCREEN KEYBOARD......................................................................................................... 22
ENGLISH KEYBOARD............................................................................................................................. 22
CHINESE KEYBOARD............................................................................................................................. 23
NUMBERS AND SYMBOLS.....................................................................................................................23
USING THE LED INDICATOR......................................................................................................................... 24
ASSISTIVE TOUCH.................................................................................................................................................. 24
USING TOUCHSCREEN..................................................................................................................................25
SHORTCUT KEYS............................................................................................................................................ 25
MANAGING STATUS BAR...............................................................................................................................26
DESKTOP MENU.............................................................................................................................................. 26
EDIT WALLPAPER.................................................................................................................................... 27
EDIT DESKTOP......................................................................................................................................... 27
ADDING AN ITEM TO DESKTOP...........................................................................................................28
MANAGING DESKTOP APPS AND ITEMS.......................................................................................... 29
MANAGING APPLICATIONS...........................................................................................................................30
HOME SCREEN.................................................................................................................................................31

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CONNECTING TO NETWORK AND DEVICES................................................................................................... 32
NETWORK..........................................................................................................................................................33
ETHERNET.........................................................................................................................................................33
WI-FI.....................................................................................................................................................................33
TURNING WI-FI ON OR OFF..................................................................................................................33
SEARCH AND ADD WI-FI........................................................................................................................ 34
BLUETOOTH...................................................................................................................................................... 34
TURNING BLUETOOTH ON OR OFF................................................................................................... 34
PAIRING GAC2500 WITH A BLUETOOTH DEVICE........................................................................... 34
CONNECTING TO A BLUETOOTH DEVICE........................................................................................ 35
SENDING FILES VIA BLUETOOTH....................................................................................................... 36
VPN SETTINGS................................................................................................................................................. 36
VLAN SETTINGS...............................................................................................................................................38
LLDP SETTINGS............................................................................................................................................... 38
802.1X MODE.....................................................................................................................................................38
MAKING PHONE CALLS......................................................................................................................................... 39
ACCOUNT...........................................................................................................................................................40
MAKING A CALL................................................................................................................................................ 40
DIRECT DIALING...................................................................................................................................... 40
ANSWERING A CALL............................................................................................................................... 42
REJECT CALL VIA SMS...........................................................................................................................43
CALL MANAGEMENT...............................................................................................................................44
CALL TRANSFER......................................................................................................................................46
DND (DO NOT DISTURB)................................................................................................................................50
MISSED CALL....................................................................................................................................................50
CALL FORWARD...............................................................................................................................................50
SET ON LCD.............................................................................................................................................. 51
SET FROM WEB GUI............................................................................................................................... 51
7-WAY CONFERENCE..................................................................................................................................... 51
INITIATING CONFERENCE.....................................................................................................................52
CONFERENCE MANAGEMENT.............................................................................................................53
END CONFERENCE.................................................................................................................................56
SCHEDULE CONFERENCE........................................................................................................................... 56
VIEW CONFERENCE DETAILS............................................................................................................. 57
ADD SCHEDULED CONFERENCE....................................................................................................... 57
EDIT SCHEDULED CONFERENCE...................................................................................................... 59
RESCHEDULE CONFERENCE..............................................................................................................59
DELETE SCHEDULED CONFERENCE................................................................................................59
DELETE HISTORY CONFERENCE....................................................................................................... 60
VOICEMAIL.........................................................................................................................................................61
APPLICATIONS......................................................................................................................................................... 62

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CONTACTS.........................................................................................................................................................63
LOCAL CONTACTS...................................................................................................................................63
GROUPS..................................................................................................................................................... 71
CREATE GROUP SHORT CUT.............................................................................................................. 73
BLACKLIST.................................................................................................................................................73
LDAP............................................................................................................................................................75
CALL HISTORY..................................................................................................................................................78
ADD CONTACT FROM CALL HISTORY............................................................................................... 80
DELETE CALL HISTORY......................................................................................................................... 80
SCHEDULE CONFERENCE VIA CALL HISTORY.............................................................................. 80
INTERCEPTED HISTORY....................................................................................................................... 81
HOTKEYS(MPK)................................................................................................................................................82
EVENTLIST.................................................................................................................................................83
MPK LIST.................................................................................................................................................... 84
MPK SETTINGS.........................................................................................................................................84
NOTICES.............................................................................................................................................................85
VIEW NOTICES......................................................................................................................................... 86
DELETE NOTICES....................................................................................................................................86
NOTICES SETTINGS............................................................................................................................... 86
FILE MANAGER.................................................................................................................................................87
COPY FILE................................................................................................................................................. 87
SEND FILE..................................................................................................................................................88
DELETE FILE............................................................................................................................................. 88
RENAME FILE............................................................................................................................................88
RECORDER....................................................................................................................................................... 88
NORMAL RECORDER............................................................................................................................. 89
CALL RECORDER.................................................................................................................................... 90
RECORDER SETTINGS.......................................................................................................................... 90
DIAGNOSIS........................................................................................................................................................ 91
BROWSER..........................................................................................................................................................91
GS MARKET.......................................................................................................................................................92
SEARCH APPS.......................................................................................................................................... 92
DOWNLOAD AND INSTALL APPS......................................................................................................... 92
UPDATE APPS...........................................................................................................................................92
FTP SERVER..................................................................................................................................................... 92
USER HELPER.................................................................................................................................................. 93
GAC2500 WEB UI FEATURES............................................................................................................................... 94
ACCESSING GAC2500 WEB GUI..................................................................................................................94
SAVING CHANGES...........................................................................................................................................95
DEFINITIONS..................................................................................................................................................... 95
CALL PAGE.........................................................................................................................................................96

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MAKING A CALL........................................................................................................................................ 97
SINGLE INCOMING CALL....................................................................................................................... 97
CONFERENCE CONTROL......................................................................................................................98
CONTACTS PAGE.............................................................................................................................................99
CONTACTS.................................................................................................................................................99
SCHEDULE.............................................................................................................................................. 101
CALL HISTORY....................................................................................................................................... 103
LDAP..........................................................................................................................................................104
EXPERIENCING GAC2500................................................................................................................................... 104

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Table of Tables
GAC2500 User Guide
Table 1 GAC2500 Tenical Specifications.............................................................................................................13
Table 2 GAC2500 Package List............................................................................................................................15
Table 3 GAC2500 Interfaces Explanations......................................................................................................... 16
Table 4 GAC2500 Status Icons Descriptions......................................................................................................21
Table 5 GAC2500 LED Indicator Descriptions................................................................................................... 24
Table 6 GAC2500 VPN File Parameters............................................................................................................. 37
Table 7 GAC2500 VLAN Configuration Parameters..........................................................................................38
Table 8 GAC2500 LLDP Configuration Parameters.......................................................................................... 38
Table 9 GAC2500 802.1X Mode Parameters..................................................................................................... 39
Table 10 GAC2500 Add Conference Parameters.............................................................................................. 58
Table 11 GAC2500 Import Contacts Parameters...............................................................................................66
Table 12 GAC2500 Download Contacts Parameters........................................................................................ 67
Table 13 GAC2500 Export Contacts Parameters.............................................................................................. 69
Table 14 GAC2500 Blacklist Settings Parameters............................................................................................ 75
Table 15 GAC2500 MOK Settings Parameters.................................................................................................. 85
Table 16 GAC2500 Users Access Permissions................................................................................................. 96

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Table of Figures
GAC2500 User Guide
Figure 1 GAC2500 Host Interface........................................................................................................................ 15
Figure 2 GAC2500 Connection Mode..................................................................................................................17
Figure 3 GAC2500 Slave Mode Screen.............................................................................................................. 18
Figure 4 GAC2500 Cascade Mode Screen........................................................................................................ 19
Figure 5 GAC2500 Select line Sequence Screen..............................................................................................20
Figure 6 GAC2500 Multi-screens......................................................................................................................... 21
Figure 7 GAC2500 Soft Keyboard - English Input Method.............................................................................. 23
Figure 8 GAC2500 English Keyboard - Uppercase...........................................................................................23
Figure 9 GAC2500 Chinese Keyboard - Google Pinyin Method..................................................................... 23
Figure 10 GAC2500 Soft Keyboard - Symbols and Numbers......................................................................... 24
Figure 11 GAC2500 Soft Keyboard - More Symbols and Numbers............................................................... 24
Figure 12 GAC2500 Finger Gestures.................................................................................................................. 25
Figure 13 GAC2500 Status Bar - Notifications...................................................................................................26
Figure 14 GAC2500 Choose Wallpaper.............................................................................................................. 27
Figure 15 GAC2500 Edit Desktop........................................................................................................................ 28
Figure 16 GAC2500 Weather Forecast Screen................................................................................................. 29
Figure 17 GAC2500 Move Weather Forecast to Desktop................................................................................ 30
Figure 18 GAC2500 Remove Weather Forecast from Desktop...................................................................... 30
Figure 19 GAC2500 Managing Applications.......................................................................................................31
Figure 20 GAC2500 Home Screen...................................................................................................................... 32
Figure 21 GAC2500 Add Wi-Fi Screen................................................................................................................34
Figure 22 GAC2500 Bluetooth - Paired Device................................................................................................. 35
Figure 23 GAC2500 Bluetooth – Headset Mode............................................................................................... 36
Figure 24 GAC2500 Add VPN Files Screen....................................................................................................... 37
Figure 25 GAC2500 Registered Account Status................................................................................................40
Figure 26 GAC2500 Single Incoming Call Screen............................................................................................ 43
Figure 27 GAC2500 New Incoming Call Screen................................................................................................43
Figure 28 GAC2500 Single Calling Screen........................................................................................................ 44
Figure 29 GAC2500 Call On Hold Screen.......................................................................................................... 45
Figure 30 GAC2500 Mew - Start Recording....................................................................................................... 46
Figure 31 GAC2500 Mute Call Screen................................................................................................................ 46
Figure 32 GAC2500 Transfer - Blind Transfer....................................................................................................47
Figure 33 GAC2500 Transfer - Attended Transfer.............................................................................................48
Figure 34 GAC2500 Call Forward - Select Forward Mode.............................................................................. 49
Figure 35 GAC2500 Call Forward - Transferring............................................................................................... 49
Figure 36 GAC2500 Call Forward - Split.............................................................................................................50
Figure 37 GAC2500 Call Forward Type Setting Screen................................................................................... 51
Figure 38 GAC2500 Call Forward Mode On Web GUI..................................................................................... 51
Figure 39 GAC2500 Conference Screen............................................................................................................ 52

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Figure 40 GAC2500 Add Party To Conference.................................................................................................. 53
Figure 41 GAC2500 3-Way Conference..............................................................................................................54
Figure 42 GAC2500 Conference-More................................................................................................................55
Figure 43 GAC2500 Schedule Screen................................................................................................................ 57
Figure 44 GAC2500 Conference Details Screen............................................................................................... 57
Figure 45 GAC2500 Add Conference Screen.................................................................................................... 58
Figure 46 GAC2500 Delete Scheduled Conference Screen............................................................................59
Figure 47 GAC2500 Delete History Conference Screen.................................................................................. 60
Figure 48 GAC2500 Batch Delete History Conference Screen.......................................................................61
Figure 49 GAC2500 Voice Mail Application........................................................................................................ 62
Figure 50 GAC2500 Contacts Screen................................................................................................................. 63
Figure 51 GAC2500 Local Contacts Screen...................................................................................................... 64
Figure 52 GAC2500 Add New Contact Screen.................................................................................................. 65
Figure 53 GAC2500 Import Contacts Parameters Screen...............................................................................65
Figure 54 GAC2500 Download Contacts Screen.............................................................................................. 66
Figure 55 GAC2500 Contact Edit Page.............................................................................................................. 68
Figure 56 GAC2500 Export Contacts Screen.................................................................................................... 69
Figure 57 GAC2500 Contacts Storage Status Screen......................................................................................70
Figure 58 GAC2500 Add Google Account - Wizard 1....................................................................................... 70
Figure 59 GAC2500 Add Google Account - Wizard 2....................................................................................... 71
Figure 60 GAC2500 Groups Screen....................................................................................................................71
Figure 61 GAC2500 Add Group Screen..............................................................................................................72
Figure 62 GAC2500 Dial Group Members Screen............................................................................................ 72
Figure 63 GAC2500 Edit Group Screen..............................................................................................................73
Figure 64 GAC2500 Blacklist Screen.................................................................................................................. 74
Figure 65 GAC2500 Manual Add Blacklist Screen............................................................................................ 74
Figure 66 GAC2500 Blacklist Settings Screen...................................................................................................75
Figure 67 GAC2500 LDAP Book Screen............................................................................................................ 76
Figure 68 GAC2500 LDAP Settings.....................................................................................................................76
Figure 69 GAC2500 Web GUI Maintenance - LDAP Book.............................................................................. 78
Figure 70 GAC2500 Add LDAP Contact To Local..............................................................................................78
Figure 71 GAC2500 Call History Screnn.............................................................................................................79
Figure 72 GAC2500 Call History Details.............................................................................................................79
Figure 73 GAC2500 Add Contact Screen........................................................................................................... 80
Figure 74 GAC2500 Conference Call History Screen.......................................................................................81
Figure 75 GAC2500 Intercepted History Screen............................................................................................... 81
Figure 76 GAC2500 Add MPK Number...............................................................................................................82
Figure 77 GAC2500 Add Number from Contacts.............................................................................................. 83
Figure 78 GAC2500 MPK Number Screen.........................................................................................................83
Figure 79 GAC2500 MPK URI Screen................................................................................................................ 84
Figure 80 GAC2500 MPK List...............................................................................................................................84

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Figure 81 GAC2500 MPK Settings Screen.........................................................................................................85
Figure 82 GAC2500 Notices Screen....................................................................................................................86
Figure 83 GAC2500 View Notices........................................................................................................................86
Figure 84 GAC2500 Notices Settings Screen.................................................................................................... 87
Figure 85 GAC2500 Incoming Call Screen.........................................................................................................87
Figure 86 GAC2500 Recorder Main Screen.......................................................................................................89
Figure 87 GAC2500 Normal Record - Recording.............................................................................................. 90
Figure 88 GAC2500 Call Recordings...................................................................................................................90
Figure 89 GAC2500 Recorder Settings Screen................................................................................................. 91
Figure 90 GAC2500 FTP Server Connection..................................................................................................... 93
Figure 91 GAC2500 FTP Server Settings...........................................................................................................93
Figure 92 GAC2500 Quick User Guide............................................................................................................... 94
Figure 93 GAC2500 Web GUI - Login................................................................................................................. 95
Figure 94 GAC2500 Web UI Tool Bar..................................................................................................................96
Figure 95 GAC2500 Web UI - Call....................................................................................................................... 97
Figure 96 GAC2500 Web UI - Single Incoming Call......................................................................................... 98
Figure 97 GAC2500 Web UI - Minimize Call Screen........................................................................................ 98
Figure 98 GAC2500 Web UI - Conference Control........................................................................................... 99
Figure 99 GAC2500 Web UI - Minimize Conference Screen...........................................................................99
Figure 100 GAC2500 Web UI - Contacts..........................................................................................................100
Figure 101 GAC2500 Web UI - Groups............................................................................................................ 101
Figure 102 GAC2500 Web Page - Blacklist..................................................................................................... 101
Figure 103 GAC2500 Web Page - Upcoming Conference............................................................................ 102
Figure 104 GAC2500 Web Page - History Conference.................................................................................. 103
Figure 105 GAC2500 Web UI - Call History..................................................................................................... 104

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CHANGE LOG
This section documents significant changes from previous versions of GAC2500 user manuals. Only
major new features or major document updates are listed here. Minor updates for corrections or editing
are not documented here.
FIRMWARE VERSION 1.0.1.34
The dial pad has a MPK access key, and MPK app has different layout
MPK app is renamed to Hotkeys
Updated call feature of Contact on dial pad
Updated LCD layout (Only reset to enable new layout. Move some apps to Tool Folder)
Enabled password for schedule conference
Added ability to star a contact to put it on top of contact
Added direct IP call on dial pad without changing call mode.
Added ability to create a hotkey for a contact or a group
Updated tool tips display on web UI
Updated RJ48 cascade mode. LCD supports complete synchronization
When screen lock is enabled, unlock is required for MPK, transfer, add to conf in a call
Added a PNP icon on status bar when enabled
Updated videos in Tips app
FIRMWARE VERSION 1.0.1.26
Added setting LCD home screen
Add ed hold/unhold for individual conference participant
Added FTP server
Added GAC2500 quick guide
FIRMWARE VERSION 1.0.1.18
Increased call history to 2000 entries
Updated 3.5mm AUX line sequence interface
Updated the screenshots
Added cycle conference
Updated the chapter of third party application

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FIRMWARE VERSION 1.0.1.6
This is the initial version.

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WELCOME
Thank you for purchasing Grandstream GAC2500 Audio Conference Phone for AndroidTM. This User
Guide describes the basic concept and tasks necessary to use and configure your GAC2500. This
document covers the topics of conference environment setups, start conference and the relevant
operations like conference reservation. To learn the advanced features and configurations, please visit
http://www.grandstream.com to download the latest "GAC2500 Administration Guide".
GAC2500 is a next generation enterprise-grade 6-line Android IP conference phone with a 4.3" capacitive
touch screen that that runs the Android Operating System and therefore offers full access to the hundreds
of thousands of Android apps in the Google Play Store, including business productivity apps such as
Skype™, Skype for Business™, and Google Hangouts™. The phone features Gigabit ports, 7-way
conference, 3x microphones, 1 Micro USB port, integrated WiFi and Bluetooth for network flexibility. The
GAC2500 delivers superior HD audio quality, rich and leading edge telephony features, automated
provisioning for easy deployment, advanced security protection for privacy, and broad interoperability with
most 3rd party SIP devices and leading SIP/NGN/IMS platforms. GAC2500 is a perfect choice for
enterprise users looking for a high performance, feature rich conference phone with superb audio quality
at competitive price.
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 the GAC2500 as it may cause damage to the products
and void the manufacturer warranty.
This document is subject to change without notice. The latest electronic version of this user manual is
available for download here:
http://www.grandstream.com/support
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.
FCC Caution:
Any Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment. This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1) This device may not cause harmful interference,
and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful

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interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
— Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
For operation within 5.15 ~ 5.25GHz / 5.47 ~5.725GHz frequency range, it is restricted to indoor
environment. The band from 5600-5650MHz will be disabled by the software during the manufacturing
and cannot be changed by the end user. This device meets all the other requirements specified in Part
15E, Section 15.407 of the FCC Rules.
Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator &
your body.

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PRODUCT OVERVIEW
FEATURE HIGHTLIGHTS
Runs Android™ 4.4 and offers full access to all Android™ conference apps in the Google Play Store
(e.g., Skype™, Skype for Business™, Google Hangouts™, etc.)
World-class high fidelity sound quality with audio bandwidth of up to 18Khz
4.3" capacitive touch screen LCD with support for flexible layout/content customization
3x microphones (12 ft. pickup range), 1x speaker (15 ft. coverage range)
Auto-sensing Gigabit Ethernet port, Wi-Fi, PoE+, Bluetooth, Micro-USB with 3.5mm audio interface
Supports standalone IP mode or USB slave mode
Supports daisy chain (up to 2 units via RJ48 CAT5) mode in large conference room for better audio
quality
NAT-T enables the phone being the Plug and Play device
Automated provisioning using TR-069 or AES encrypted XML configuration file, TLS/SRTP/HTTPS for
advanced security and privacy protection
Table 1 GAC2500 Tenical Specifications
Specification
Description
Protocols/
Standards
SIP RFC3261，TCP/IP/UDP，RTP/RTCP，HTTP/HTTPS，ARP，ICMP，DNS (A
record ，SRV ，NAPTR) ，DHCP ，PPPoE ，SSH ，TFTP ，NTP ，STUN ，
SIMPLE ，LLDP ，LDAP ，TR-069 ，802.1x ，TLS ，SRTP ，IPv6 (pending) ，
OpenVPN (pending)
Voice Codec
Support for G.711µ/a, G.722, G.726, iLBC, Opus, G.722.1, G.722.1c (pending), in-
band and out-of-band DTMF (In audio, RFC2833, SIP INFO)
Platform Bridging
Bridge SIP calls with any Android™ VoIP apps such as Skype™, Skype for
Business (Lync), Google Hangouts™ and more
Telephony
Features
Hold, transfer, forward (unconditional/no-answer/busy/conditional), call park/pickup,
7-way audio conference, auto answer, downloadable XML phone book (up to 2000
entries), LDAP, call waiting, call history (up to 2000 entries), flexible dial plan,
personalized music ringtones, server redundancy & fail-over
Sample
Applications
Skype™, Google Hangouts™, Skype for Business (Lync), Web browser,
Facebook™, Twitter™, YouTube, Google calendar, mobile phone data import/export
via Bluetooth, etc. API/SDK available for advanced custom application development
Application
Deployment
Allows Android 4.4 compliant applications to be deployed in the device with
provisioning control
QoS
Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS
Security
User and administrator level passwords, MD5 and MD5-sess based authentication,
256-bit AES encrypted configuration file, TLS, 128/256-bit SRTP/TLS, HTTPS,

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802.1x media access control
Multi-Language
English, German, Italian, French, Spanish, Portuguese, Russian, Turkish, Polish,
Chinese, Korean, Japanese, and more
Upgrade/
Provisioning
Firmware upgrade via TFTP / HTTP / HTTPS or local HTTP upload, mass
provisioning using TR-069 or AES encrypted XML configuration file
Network Interface
1x auto-sensing Gigabit Ethernet port, integrated 2.4GHZ auto-band Wi-Fi
(802.11a/b/g/n) and 4.0 Bluetooth.
HD Audio
3x microphones (12 ft. pickup range), 1x speaker (220-18,000 Hz, 15 ft. coverage
range up to 86dB )
Auxiliary Ports
3.5mm audio interface, Micro-USB interface, RJ48 interface, reset pin
Graphic Display
4.3" (800*480) capacitive touch screen LCD
Power & Green
Energy Efficiency
Universal power adapter included: Input: 100-240VAC 50-60Hz; Output: 12VDC, 2A
(24W)
Temperature and
Humidity
Operating: 32 - 104oF / 0 - 40oC
Storage: 14 - 140oF / -10 - 60oC
Humidity: 10% to 90% Non-condensing
Compliance
FCC: Part 15 (CFR 47) Class B; UL 60950 (power adapter)
CE：EN55022 Class B，EN55024，EN61000-3-2，EN61000-3-3，EN60950-1，
EN62479，RoHS
RCM：AS/ACIF S004；AS/NZS CISPR22/24；AS/NZS 60950；AS/NZS 4268
SAFETY COMPLIANCES
The GAC2500 complies with FCC/CE, RCM and various safety standards. The GAC2500 power adapter
is compliant with the UL standard. Use the universal power adapter provided with the GAC2500 package
only. The manufacturer’s warranty does not cover damages to the phone caused by unsupported power
adapters.
WARRANTY
If the GAC2500 phone is purchased from a reseller, please contact the company where the device is
purchased for replacement, repair or refund. If the phone is purchased directly from Grandstream, please
contact Grandstream Support for a RMA (Return Materials Authorization) number before the product is
returned. Grandstream reserves the right to remedy warranty policy without prior notification.

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INSTALLING GAC2500
EQUIPMENT PACKAGE CONTENT
The GAC2500 package contains the following items:
Table 2 GAC2500 Package List
Name
Number
GAC2500 Main Case
1
12V Universal Power Adapter with power cable
1
Ethernet Cable
1
Micro-USB Cable
1
RJ48 CAT5
1
Quick Installation Guide
1
GPL license
1
PRODUCT APPEARANCE
Figure 1 GAC2500 Host Interface

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Table 3 GAC2500 Interfaces Explanations
NO.
Name
Explanation
1
RJ48 Interface
Daisy chain (up to 2 units via RJ48 CAT5) mode in large
conference room for better audio quality.
2
RJ45 Network
Interface
Connect to LAN port.
3
12V DC Power
Supply Interface
Connect to Power Adaptor.
4
Micro USB Interface
USB OTG devices can be connected to GAC2500 via the USB
cable. For example, connect a USB flash drive to read data, or
PC USB Interface or GVC32XX SPKR Interface can be
connected to the GAC2500 USB Interface via USB cable for
audio pickup and play
5
3.5mm Audio
Interface
Connect to 3.5mm devices like mobile phone or PC for mobile
audio pickup and play
6
Reset Pin
When the GAC2500 is powered up, use a small pin to press
the button one time to reboot.
When powering up GAC2500, long press the button for 4 to
9 seconds to detect whether firmware file exists in USB
OTG device to update system.
When powering up GAC2500, long press the button for
more than 10 seconds to quick restore factory settings.
CONNECTING GAC2500
To deploy a working conferencing system, users could select standalone IP mode, USB slave mode,
cascade mode or mobile phone mode. Please connect the GAC2500 for each mode according to different
procedures.

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Figure 2 GAC2500 Connection Mode
IP MODE
The GAC2500 is used as an independent phone in IP mode. Please follow the steps below to connect.
1. Connect the LAN port of the device to the external network port (the port in the office or at home) via
Ethernet cable;
2. Plug in the power adapter into the power supply interface then power up the GAC2500.

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Note:
It is recommended to use IP mode in room 3.6m* 7.2m or smaller.
USB SLAVE MODE
GAC2500 can be used as auxiliary device for GVC3200 or PC for audio acquisition and play. The
conference feature will be disabled in USB slave mode. Follow the steps below to connect route.
1. Connect one end of the USB cable to the Micro USB port of the device and the other end to the USB
port of GVC3200/PC;
2. Plug in the power adapter into the power supply interface then power up the GAC2500.
The GAC2500 screen is as shown below in USB slave mode, you can tap on the volume icon to adjust
the volume of GVC3200/PC. When connecting to GVC3200, tap on "Mute", "Answer" or "Hangup" icons
for more operations.
Figure 3 GAC2500 Slave Mode Screen
Note:
If GAC2500 is connecting to PC via Micro-USB but there is no audio output from GAC2500, it is because
the PC uses default audio output in most cases. Please configure GAC2500 as default audio output.
CASCADE MODE
Connect two GAC2500 (s) via RJ48 CAT5 for larger space. Please follow the steps below to connect.
1. Connect the LAN port of the device to the external network port (the port in the office or at home) via
Ethernet cable;
2. Connect the RJ48 ports of two devices with RJ48 CAT5;
3. Plug in two power adapters into the power supply interfaces then power up two devices;

Firmware Version 1.0.1.34
GVC2500 User Guide
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4. The screen is as shown below. Tap on "Yes" on the first device and set it to be the master while the
other the slave.
Figure 4 GAC2500 Cascade Mode Screen
Note:
1. It is recommended to use cascade mode in room 7.2m*12.2m or smaller.
2. Please keep a distance of 5m between two devices.
3. Please make sure the master device is connected to the network or it may not work properly.
4. The slave device will synchronize with the master device and their dial screens will be shown
synchronously.
MOBILE PHONE MODE
GAC2500 could be connected to mobile phone for expanded use. Please follow the steps to connect.
1. Connect the LAN port of the device to the external network port (the port in the office or at home) via
Ethernet cable;
2. Plug in the power adapter into the power supply interface then power up the GAC2500;
3. Connect one end of the via 3.5mm audio aux cable to 3.5mm headset interface on the mobile phone
first, then connect the other end to 3.5mm audio interface on GAC2500, once connected, it will
access 3.5mm AUX call screen;
If the audio quality is not good, it may be the line sequence issue, you can hold the screen at the top of
the status bar, drag and drop down to open the status bar, tap on line sequence notifications and select
the line sequence the same as the one of 3.5mm headset interface on the mobile phone.