Grandstream Networks GAC2500 Instruction Manual

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

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GAC2500 Administration 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 guide 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 guide, could void your manufacturer warranty.
WARNING
Please do not use a different power adaptor with devices as it may cause damage to the products and void
the manufacturer warranty.

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GAC2500 Administration Guide
GNU GPL INFORMATION
GAC2500 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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GAC2500 Administration Guide
Table of Content
DOCUMENT PURPOSE .................................................................................................9
CHANGE LOG..............................................................................................................10
Firmware Version 1.0.3.13 ...................................................................................................................10
Firmware Version 1.0.3.11 ...................................................................................................................10
Firmware Version 1.0.3.5 .....................................................................................................................10
Firmware Version 1.0.1.45 ................................................................................................................... 11
Firmware Version 1.0.1.44 ................................................................................................................... 11
Firmware Version 1.0.1.40 ................................................................................................................... 11
Firmware Version 1.0.1.34 ................................................................................................................... 11
Firmware Version 1.0.1.26 ................................................................................................................... 11
Firmware Version 1.0.1.18 ................................................................................................................... 11
Firmware Version 1.0.1.16 ...................................................................................................................12
WELCOME ...................................................................................................................13
PRODUCT OVERVIEW ................................................................................................14
Feature Highlights................................................................................................................................14
GAC2500 Technical Specifications ......................................................................................................15
GETTING STARTED.....................................................................................................17
Equipment Packaging..........................................................................................................................17
Powering GAC2500 .............................................................................................................................17
Connection Configuration ....................................................................................................................18
Standard Connection ....................................................................................................................18
Integrated Connection ..................................................................................................................19
GAC2500 LCD SETTINGS ...........................................................................................21
Use the Touchscreen ...........................................................................................................................21
Personalized Account ..........................................................................................................................22
Sound...................................................................................................................................................23
Bluetooth..............................................................................................................................................23
Display .................................................................................................................................................23
Storage ................................................................................................................................................24
Applications..........................................................................................................................................24
Location Access ...................................................................................................................................24
Language & Keyboard .........................................................................................................................24
Account ................................................................................................................................................24
Date & Time .........................................................................................................................................24
About Phone ........................................................................................................................................25
Advanced Settings ...............................................................................................................................25

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GAC2500 Administration Guide
Reboot .................................................................................................................................................29
GAC2500 WEB GUI SETTINGS...................................................................................30
Accessing GAC2500 Web GUI............................................................................................................30
Saving Changes...................................................................................................................................30
Definitions ............................................................................................................................................31
Toolbar .................................................................................................................................................31
Contacts Page Definitions ...................................................................................................................32
Contacts - Contacts ......................................................................................................................32
Contacts - Groups.........................................................................................................................35
Contacts - Blacklist .......................................................................................................................35
Contacts - Schedule .....................................................................................................................36
Contacts - Call History..................................................................................................................36
Contacts - LDAP ...........................................................................................................................36
Account Settings Page Definitions.......................................................................................................38
Account - General Settings...........................................................................................................38
Account - Network Settings ..........................................................................................................39
Account - SIP Settings..................................................................................................................40
Account - Codec Settings .............................................................................................................45
Account - Call Settings .................................................................................................................46
Advanced Settings Page Definitions....................................................................................................51
Advanced Settings - General Settings..........................................................................................51
Advanced Settings - Call Features ...............................................................................................53
Advanced Settings - Tone Generator ...........................................................................................55
Advanced Settings - Multicast Paging..........................................................................................56
Advanced Settings- MPK General Settings..................................................................................57
Advanced - MPK LCD Settings ....................................................................................................57
Maintenance Page Definitions .............................................................................................................58
Maintenance - Network Settings...................................................................................................58
Maintenance - Wi-Fi Settings .......................................................................................................60
Maintenance - Time & Language .................................................................................................60
Maintenance - Security Settings...................................................................................................61
Maintenance - Upgrade ................................................................................................................62
Maintenance - Recording .............................................................................................................65
Maintenance - Troubleshooting ....................................................................................................65
Maintenance - Event Notify ..........................................................................................................66
Maintenance - TR-069 ..................................................................................................................67
Maintenance - Device Manager....................................................................................................67
Status Page Definitions........................................................................................................................68
Status - Account............................................................................................................................68
Status - Network ...........................................................................................................................68
Status - System Info .....................................................................................................................69

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GAC2500 Administration Guide
Status - Storage Info.....................................................................................................................69
CALL FEATURES.........................................................................................................70
UPGRADING AND PROVISIONING ............................................................................72
Upgrade and Provisioning Configuration .............................................................................................72
Configure via Keypad Menu .........................................................................................................72
Configure via Web GUI.................................................................................................................72
Upload Firmware Locally .....................................................................................................................73
No Local Firmware Servers .................................................................................................................74
Provisioning and Configuration File Download....................................................................................75
Provision as Provision Server (PNP) ...................................................................................................75
BACKUP.......................................................................................................................77
FACTORY RESET ........................................................................................................79
Restore to Factory Default via LCD Menu ...........................................................................................79
Restore to Factory Default via the Web GUI .......................................................................................80
Reset Via Button ..................................................................................................................................80
EXPERIENCING THE GAC2500 APPLICATION PHONE............................................81

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GAC2500 Administration Guide
Table of Tables
Table 1: GAC2500 Features in a Glance ....................................................................................................14
Table 2: GAC2500 Technical Specifications ...............................................................................................15
Table 3: Equipment Packaging ...................................................................................................................17
Table 4: Bluetooth Settings Parameters......................................................................................................23
Table 5: Account Settings Parameters ........................................................................................................25
Table 6: UCM Auto Config Number.............................................................................................................26
Table 7: Ethernet IPv4 Settings Parameters...............................................................................................26
Table 8: Wi-Fi Settings Parameters ............................................................................................................27
Table 9: VPN Settings Parameters .............................................................................................................27
Table 10: Proxy Settings Parameters..........................................................................................................27
Table 11: Additional Network Settings Parameters .....................................................................................28
Table 12: Security Settings Parameters......................................................................................................28
Table 13: GAC2500 Users Access Permission ...........................................................................................31
Table 14: Contacts - Import.........................................................................................................................32
Table 15: Contacts - Export.........................................................................................................................33
Table 16: Contacts - Download ...................................................................................................................33
Table 17: Contacts - New Contact ..............................................................................................................34
Table 18: Contacts - Groups .......................................................................................................................35
Table 19: Contacts - Blacklist - Manually add .............................................................................................35
Table 20: Contacts - Settings ......................................................................................................................35
Table 21: Contacts - Schedule ....................................................................................................................36
Table 22: Contacts - LDAP..........................................................................................................................36
Table 23: Account - General Settings..........................................................................................................38
Table 24: Account - Network Settings .........................................................................................................39
Table 25: Account - SIP Settings.................................................................................................................40
Table 26: Account - Codec & RTP Settings ................................................................................................45
Table 27: Account - Call Settings ................................................................................................................46
Table 28: Advanced - General Settings.......................................................................................................52
Table 29: Advanced - Call Features ............................................................................................................53
Table 30: Advanced - Tone Generator Settings ..........................................................................................55
Table 31: Multicast Paging ..........................................................................................................................56
Table 32: Advanced - MPK General Settings..............................................................................................57
Table 33: Advanced - MPK LCD Settings ...................................................................................................57
Table 34: Maintenance - Network Settings .................................................................................................58
Table 35: Wi-Fi Settings ..............................................................................................................................60
Table 36: Maintenance - Time & Language ................................................................................................60
Table 37: Maintenance - Security Settings..................................................................................................61
Table 38: Maintenance - Upgrade...............................................................................................................62
Table 39: Maintenance - Recording ............................................................................................................65
Table 40: Maintenance - Troubleshooting ...................................................................................................65

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Table 41: Maintenance - Device Manager ..................................................................................................67
Table 42: Status - Account ..........................................................................................................................68
Table 43: Status - Network..........................................................................................................................68
Table 44: Status - System Info ....................................................................................................................69
Table 45: Feature Codes.............................................................................................................................70
Table 46: Provision Server Settings ............................................................................................................75

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GAC2500 Administration Guide
Table of Figures
Figure 1: GAC2500 Package Content ........................................................................................................17
Figure 2: Powering the GAC2500 ...............................................................................................................18
Figure 3: Connecting the GAC2500............................................................................................................19
Figure 4: Connection Interface on the GAC2500........................................................................................19
Figure 5: GAC2500 Finger Gestures on the Touch Screen ........................................................................21
Figure 6: GAC2500 Default Home Screen..................................................................................................22
Figure 7: GAC2500 Settings .......................................................................................................................22
Figure 8: Web UI - Login .............................................................................................................................30
Figure 9: Web UI - Tool Bar.........................................................................................................................32
Figure 10: GAC2500 Storage Info ..............................................................................................................69
Figure 11: GAC2500 Upgrade Configuration via LCD ................................................................................72
Figure 12: GAC2500 Upgrade Configuration via Web GUI ........................................................................73
Figure 13: Upload Firmware Locally ...........................................................................................................74
Figure 14: Provision Server Settings ..........................................................................................................75
Figure 15: Provision Record........................................................................................................................76
Figure 16: Backup Files List........................................................................................................................77
Figure 17: Select Data to Restore...............................................................................................................77
Figure 18: Auto Backup Settings.................................................................................................................78
Figure 19: Configure Backup Files Directory ..............................................................................................78
Figure 20: Factory reset ..............................................................................................................................79
Figure 21: Factory Reset on Web UI ..........................................................................................................80
Figure 22 Web UI - Factory Reset Confirmation.........................................................................................80

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GAC2500 Administration Guide
DOCUMENT PURPOSE
This document describes how to configure the GAC2500 via the LCD menu and web UI menu to fully
manipulate GAC's features. To learn the advanced functions of GAC2500, please visit
http://www.grandstream.com/support to download the latest “GAC2500 User Guide”.
This guide covers following topics:
•Product Overview
•Getting Started
•GAC2500 LCD Settings
•GAC2500 WEB GUI Settings
•Call Features
•Upgrade and Provisioning
•Backup
•Factory Reset
•Experiencing GAC2500

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GAC2500 Administration Guide
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 1.0.3.13
•Updated tool tip for web UI -> Maintenance -> Network settings -> Bypass Proxy For, Multiple IP
addresses can be separated by ",”. [Maintenance - Network Settings]
•Updated that DUT does not support multicast paging using port 0. [Advanced Settings - Multicast
Paging]
Firmware Version 1.0.3.11
•Added support for RED with FEC. [Enable Audio RED with FEC]
•Updated default NTP server address. [Specify NTP Server Address]
Firmware Version 1.0.3.5
•Supported IPv6. [IPv6 address]
•Supported setting Wi-Fi from web UI -> Maintenance. [Maintenance - Wi-Fi Settings]
•Added input inspection of multicast paging on web UI.
•Added support for DHCP Option 132 & 133 tunneled through DHCP Option 43. [DHCP VLAN Override]
•Added “Medium room & Rich voice” and “Medium Room & Clear Voice” option. [Voice Mode]
•Added support to disable SSH without reboot. [Disable SSH]
•On web UI MPK settings, Multicast Paging does not need to set the account. [Advanced Settings -
Multicast Paging]
•Removed “Hide Local Call History” under web UI -> Advanced -> General Settings.
•Added contact categories when creating a new conference in web UI. [Contacts - Schedule]
•Changed web UI LDAP Max Hits valid range to 0 - 4000. [Max Hits]
•Updated tooltip for “Complete upgrade” and “Unregister before new registration”.
•Added more voice mode “Medium room & Rich voice”, “Medium Room & Clear Voice”, “Small room &
Denoise”, and “Small & Enhanced Denoise”. [Voice Mode]
•Added support for “Hide Vocoder”. When set to “Yes”, the codec information in an active call will be
hidden. [Hide Vocoder]
•Changed the layout of creating new group on web UI. [Contacts - Groups]
•Synchronized the mute icon of minimized call interface on web UI.
•Added Core dump feature. [Enable Core Dump Generation]
•Added “Disable web GUI”. [Disable web GUI]
•Updated description under Contacts -> LDAP page.
•Added support for fixed slave mode in web UI. [Fixed Slave Mode]

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GAC2500 Administration Guide
•Added “User Authority Management” for admin under Web UI. [User Authority Management]
•Added support for special control character 'T' in dialplan. [Dial Plan]
•Added “Intercom barging” in Web UI. [Intercom Barging]
•Added support for dialing multiple members in Conf room during a call on web UI.
Firmware Version 1.0.1.45
•Added support for new hardware version
Firmware Version 1.0.1.44
•No major changes
Firmware Version 1.0.1.40
•Added Guest Login option. [Guest Login]
•Hided 'Virtual Account Group' setting, only visible under expert mode. [Virtual Account Group]
Firmware Version 1.0.1.34
•Dial plan improvements, supports direct IP call. [Dial Plan]
•Added UCM auto config number in Advanced Account settings.
•Added Codec Negotiation Priority in Codec & RTP settings. [Codec Negotiation Priority]
•Added Enable Conference Room Quite Mode. [Enable Conference Room Quite Mode]
Firmware Version 1.0.1.26
•Removed In-Call Sound EQ and added Voice Mode.
•Added Conference Mode option. [Conference Server]
•Added Mute Indicator control for device.
•Added Recorder Editing from web UI. [Record Mode]
•Added storage information on web UI. [Status - Storage Info]
•Added Constraint Mode option in Configuration via Keypad Menu. [Configuration via Keypad Menu]
•Added Provision Server app. [Provision as Provision Server (PNP)]
•Added backup app. [BACKUP]
•Updated Advanced settings in LCD.
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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GAC2500 Administration Guide
Firmware Version 1.0.1.16
•This is the initial version.

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GAC2500 Administration Guide
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/support/resources/?title=GAC2500 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.

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GAC2500 Administration Guide
PRODUCT OVERVIEW
Feature Highlights
The following tables contain the major features of the GAC2500:
Table 1: GAC2500 Features in a Glance
GAC2500
•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

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GAC2500 Administration Guide
GAC2500 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 GAC2500.
Table 2: GAC2500 Technical Specifications
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, OpenVPN (pending)
Voice Codec
Support for G.711µ/a, G.722, G.726, iLBC, Opus, G.722.1 and G.722.1c
(pending), in-band and out-of-band DTMF (In audio, RFC2833, SIP INFO),
G.729A/B, VAD, CNG, AEC, PLC, AJB, AGC
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, 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;

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GAC2500 Administration Guide
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

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GAC2500 Administration 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 GAC2500.
Equipment Packaging
Table 3: Equipment Packaging
Note: Check the package before installation. If you find anything missing, contact your system administrator.
Powering GAC2500
The GAC2500 can be powered either using POE or PSU, please refer to the following picture to have more
visibility how to connect your audio conferencing system.
GAC2500
•1 x GAC2500 Main Case.
•1 x 12V Power Adapter.
•1 x Ethernet Cable
•1 x Micro-USB Cable
•1 x RJ48 CAT5
•1 x Quick Installation Guide
•1 x GPL License
Figure 1: GAC2500 Package Content

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GAC2500 Administration Guide
Figure 2: Powering the GAC2500
Connection Configuration
GAC2500 provides 2 connection configurations:
•Standard connection (extendable cascade connection and mobile device connection).
•Integrated connection (slave mode connection).
Standard Connection
1. Connect the LAN port of the phone to the RJ-45 socket of a hub/switch or a router.
2. Connect the 12V DC output plug to the power jack on the phone; plug the power adapter into an
electrical outlet. If PoE switch is used in step 1, this step could be skipped.
3. The LCD will display booting up or firmware upgrading information. Before continuing, please wait
for the main screen display to show up.
4. On the web configuration interface or from the menu of the touch screen, you can further configure
network connection using static IP, DHCP and etc.

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GAC2500 Administration Guide
Integrated Connection
1. Connect the 12V DC to the power jack on the phone; plug the power adapter into an electrical outlet.
2. After the device boots up, connect the Micro-USB port to the USB port of GVC32xx or PC, as shown
above.
3. The LCD will display the cascade connection interface, as shown below
Figure 4: Connection Interface on the GAC2500
Figure 3: Connecting the GAC2500