Grandstream Networks GXW4248 User manual

GXW42XX User Manual www.grandstream.com
Firmware Version 1.0.0.49 [e-mail]
Grandstream Networks, Inc.
Analog IP Gateway GXW4248

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GXW4248 USER MANUAL
INDEX
GNU GPL INFORMATION..........................................................................5
CHANGE LOG ...........................................................................................6
WELCOME.................................................................................................7
GATEWAY GXW4248 OVERVIEW........................................................................................................7
SAFETY COMPLIANCE........................................................................................................................7
WARRANTY...........................................................................................................................................7
CONNECT YOUR GXW4248 GATEWAY ...................................................9
EQUIPMENT PACKAGING ...................................................................................................................9
CONNECT THE GXW4248 ...................................................................................................................9
GXW4248 FEATURES .............................................................................13
SOFTWARE FEATURES OVERVIEW ................................................................................................13
HARDWARE SPECIFICATION............................................................................................................14
GXW4248 LCD MENU.........................................................................................................................15
FIGURE 3: LCD MENUBASIC OPERATIONS.........................................16
BASIC OPERATIONS ..............................................................................17
UNDERSTANDING GXW VOICE PROMPTS.....................................................................................17
PLACING A PHONE CALL ..................................................................................................................18
PHONE OR EXTENSION NUMBERS..........................................................................................18
DIRECT IP CALLS........................................................................................................................19
CALL HOLD.........................................................................................................................................20
CALL WAITING....................................................................................................................................20
CALL TRANSFER................................................................................................................................20
BLIND TRANSFER.......................................................................................................................20
ATTENDED TRANSFER ..............................................................................................................21
3-WAY CONFERENCING....................................................................................................................21
HUNTING GROUP ..............................................................................................................................21
INTER-PORT CALLING.......................................................................................................................23
SENDING AND RECEIVING FAX .......................................................................................................24
SUPPORT RADIUS PROTOCOL........................................................................................................24

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CALL FEATURES ....................................................................................25
CONFIGURATION GUIDE........................................................................27
CONFIGURING GXW4248 VIA VOICE PROMPT ..............................................................................27
CONFIGURING GXW4248 WITH WEB BROWSER ..........................................................................27
ACCESS THE WEB CONFIGURATION MENU...........................................................................28
IMPORTANT SETTINGS.....................................................................................................................28
NAT SETTINGS............................................................................................................................28
DTMF METHODS.........................................................................................................................29
PREFERRED VOCODER (CODEC)............................................................................................29
SAVING THE CONFIGURATION CHANGES......................................................................................48
REBOOTING FROM REMOTE...........................................................................................................49
CONFIGURATION THROUGH A CENTRAL SERVER.......................................................................49
SOFTWARE UPGRADE...........................................................................50
FIRMWARE UPGRADE THROUGH TFTP/HTTP/HTTPS..................................................................50
INSTRUCTIONS FOR LOCAL FIRMWARE UPGRADE:....................................................................51
CONFIGURATION FILE DOWNLOAD................................................................................................51
FIRMWARE AND CONFIGURATION FILE PREFIX AND POSTFIX ..................................................52
MANAGING FIRMWARE AND CONFIGURATION FILE DOWNLOAD..............................................52
RESTORE FACTORY DEFAULT SETTING .............................................53
FACTORY RESET...............................................................................................................................53
RESET BUTTON..........................................................................................................................53
IVR COMMAND............................................................................................................................53

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TABLE OF FIGURES
GXW4248 User Manual
Figure 1: Diagram of GXW4248 Panel .......................................................................................................10
Figure 2: 50 Pin Telco Connector................................................................................................................11
Figure 3: LCD Menu....................................................................................................................................16
TABLE OF TABLES
GXW4248 User Manual
Table 1: Definitions of the GXW Connectors..............................................................................................10
Table 2: Definitions of the GXW Display Panel..........................................................................................10
Table 3: GXW4248 Software Features ......................................................................................................13
Table 4: Hardware Specification of GXW4248 gateway ............................................................................14
Table 5: Definitions of the GXW Voice Prompts.........................................................................................17
Table 6: Call Features Table (Star Code)...................................................................................................25
Table 7: Status............................................................................................................................................30
Table 8: Maintenance.................................................................................................................................31
Table 9: Advanced settings ........................................................................................................................36
Table 10: Profiles........................................................................................................................................37
Table 11: FXS Ports....................................................................................................................................48
CONFIGURATION GUI INTERFACE EXAMPLES
GXW4248 User Manual
http://www.grandstream.com/products/gxw_series/GXW42xx/documents/GXW42xx_gui.zip
1. SCREENSHOT OF ADVANCED SETTINGS CONFIGURATION PAGE
2. SCREENSHOT OF BASIC SETTINGS CONFIGURATION PAGE
3. SCREENSHOT OF FXS PORTS CONFIGURATION LOGIN PAGE
4. SCREENSHOT OF PROFILE 1CONFIGURATION PAGE
5. SCREENSHOT OF PROFILE 2CONFIGURATION PAGE
6. SCREENSHOT OF STATUS PAGE

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GNU GPL INFORMATION
GXW4248 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_gpl .

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 6 OF 54
CHANGE LOG
This section documents significant changes from previous versions of GXW4248 user manuals. Only
major new features or major document updates are listed here. Minor updates for corrections or editing
are not documented here.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 7 OF 54
WELCOME
Thank you for purchasing the Grandstream GXW4248 Analog FXS IP Gateway. The GXW4248 offers an
easy to manage, easy to configure IP communications solution for any business with virtual and/or branch
locations. The GXW4248 supports popular voice codecs and is designed for full SIP compatibility and
interoperability with third party SIP providers, thus enabling you to fully leverage the benefits of VoIP
technology, integrate a traditional phone system into a VoIP network, and efficiently manage
communication costs.
This manual will help you learn how to operate and manage your GXW FXS Analog IP Gateway and
make the best use of its many upgraded features including simple and quick installation, multi-party
conferencing, and direct IP-IP Calling. This IP Analog Gateway is very easy to manage and scalable,
specifically designed to be an easy to use and affordable VoIP solution for the small – medium business
or enterprise.
GATEWAY GXW4248 OVERVIEW
The new GXW4248 has a compact and quiet design and offers superb audio quality, rich feature
functionality, strong security protection, and good manageability. It is auto-configurable, remotely
manageable and scalable.
The GXW4248 features 48 port FXS interface for analog telephones, dual 10/100/1000Mbps network
ports, and RJ21 analog port. In addition, it supports the option of 4 SIP Server profiles, caller ID for
various countries/regions, T.38 fax, flexible dialing plans, security protection (SIPS/TLS), comprehensive
voice codec including G.711 (a/u-law), G.723.1, G.726(16/24/32/40 bit rates), iLBC and G.729.
SAFETY COMPLIANCE
The GXW4248 is compliant with various safety standards including FCC/CE. Its power adapter is
compliant with UL standard. Warning: use only the power adapter included in the GXW4248 package.
Use of alternative power adapter may permanently damage the unit.
WARRANTY
Grandstream has a reseller agreement with our reseller customers. End users should contact the
company from whom the product was purchased, for replacement, repair or refund.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 8 OF 54
If you purchased the product directly from Grandstream, contact your Grandstream Sales and Service
Representative for an RMA (Return Materials Authorization) number. Grandstream reserves the right to
change the warranty policy without prior notification.
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.
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.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 9 OF 54
CONNECT YOUR GXW4248 GATEWAY
Connecting the GXW4248 gateway is easy. Before you begin, please verify the contents of the
GXW4248 package.
EQUIPMENT PACKAGING
Unpack and check all accessories. Equipment includes:
•one device unit
•one RJ45 Ethernet cable
•one 24V 6.5A universal power adapter
•mount
CONNECT THE GXW4248
Follow these four (4) steps to connect your GXW4248 gateway to the Internet and access the unit’s
configuration pages.
1. Connect standard touch-tone analog phones to the GXW4248’s RJ21 port with a RJ11 to R21
cable.
2. Insert an RJ45 Ethernet cable into the WAN port of GXW4248 and connect the other end to an
uplink port (a router or a modem, etc.)
3. Plug the power adapter into the GXW4248 gateway into a power outlet.
Follow the instructions from the topic “Configuring GXW 42XX with Web Browser” for initial configuration.
The GUI pages will guide you through the remaining steps to set-up your gateway.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 10 OF 54
FIGURE 1: DIAGRAM OF GXW4248 PANEL
TABLE 1: DEFINITIONS OF THE GXW CONNECTORS
Ethernet port
Connect to the internal LAN network or router
RESET
Factory Reset button. Press and hold for a while to reset factory default settings.
DC IN
Power adapter connection
Analog port
Connect to analog phones / fax machines with an RJ21 to RJ11 cable
FXS ports
FXS port to be connected to analog phones / fax machines.
Note: Once the GXW4248 is turned on and configured, the front display panel indicates the status of the
unit.
TABLE 2: DEFINITIONS OF THE GXW DISPLAY PANEL
Act LED
Remains ON if plug the network cable.
LINK LED
Indicates Ethernet port activity.
FXS LED
Indicate status of the respective FXS Ports on the back panel
Busy - ON (Solid Green)
Available - OFF
Slow blinking FXS LEDs indicates Voice Mail for that port.
All FXS LEDs slow blinking indicates provisioning.

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Pin
Signal
Pin
Signal
1
RING1
26
TIP1
2
RING2
27
TIP2
3
RING3
28
TIP3
4
RING4
29
TIP4
5
RING5
30
TIP5
6
RING6
31
TIP6
7
RING7
32
TIP7
8
RING8
33
TIP8
9
RING9
34
TIP9
10
RING10
35
TIP10
11
RING11
36
TIP11
12
RING12
37
TIP12
13
RING13
38
TIP13
14
RING14
39
TIP14
15
RING15
40
TIP15
16
RING16
41
TIP16
17
RING17
42
TIP17
18
RING18
43
TIP18
19
RING19
44
TIP19
20
RING20
45
TIP20
21
RING21
46
TIP21
22
RING22
47
TIP22
23
RING23
48
TIP23
24
RING24
49
TIP24
FIGURE 2: 50 PIN TELCO CONNECTOR
NOTE:
The last pair of pin 25 and 50 on each RJ21 is not connected.
All LED lights display green when ON.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 12 OF 54
LINK LED and ACT LED blinking in following status indicate different network speed.
10M: LINK and ACT all blink, ACT blinks faster then LINK
100M: LINK and ACT all blink, ACT blinks the same fast as LINK
1000M: LINK does not blink, only ACT blink
Slow blinking of FXS LED together indicates a firmware upgrade or provisioning state.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 13 OF 54
GXW4248 FEATURES
The GXW4248 is a next generation IP voice gateway that is interoperable and compatible with leading IP-
PBXs, Soft switches and SIP platforms. The GXW4248 FXS gateway is auto-configurable, remotely
manageable and scalable. The GXW4248 offers superb voice quality, traditional telephony functionality,
easy deployment, and 48 FXS ports. Each model features flexible dialing plans, integrated call routing to
support a pure IP network call and an external power supply.
SOFTWARE FEATURES OVERVIEW
•48 FXS ports
•RJ-45 Ethernet ports
•4 configurable SIP profiles
•Supports Voice Codecs:
G711(a/µ, Annex I & II), G723.1A, G726 (ADPCM with 16/24/32/40 bit rates), G729 A/B, iLBC,
T.38 Fax
•Comprehensive Dial Plan support for Outgoing calls.
•G.168 Echo Cancellation
•Voice Activation Detection (VAD), Comfort Noise Generation (CNG), and Packet Loss
Concealment (PLC)
•Supports PSTN/PBX analog telephone sets or analog trunks
TABLE 3: GXW4248 SOFTWARE FEATURES
GXW4248
Telephone Interfaces
48 FXS ports
SIP Provisioning
48 SIP accounts, 4 profiles
Network Interface
10/100/1000 Mbps, RJ-45
Number of Concurrent
Calls (except when using
SRTP)
48 Concurrent Calls
Voice over Packet
Capabilities
Voice Activity Detection (VAD) with C
NG (comfort noise generation) and PLC (packet
loss concealment), LEC with NLP Packetized Voice Protocol Unit (supports

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 14 OF 54
RTP/RTCP and AAL2 protocol), G.168 compliant Echo Cancellation, Dynamic Jitter
Buffer, Modem detection & auto-switch to G.711
Voice Compression
G.711 + Annex I (PLC), Annex II (VAD/CNG format) encoder and decoder, G.722
(pending), G.723.1A, G.726(ADPCM with 16/24/32/40 bit rates), G.729, iLBC, G.726
provides proprietary VAD, CNG, and signal power estimation, Voice Play Out unit
(reordering
, fixed and adaptive jitter buffer, clock synchronization), AGC (automatic
gain control),
Status output, Decoder controlling via voice packet header
DHCP Server/Client DHCP Client only
Fax over IP T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-
switch to G.711 for Fax
Pass-through,
Fax Datapump V.17, V.21, V.27ter, V.29 for T.38 fax relay
QoS DiffServ, TOS, 802.1P/Q VLAN tagging
Transport Protocol RTP/RTCP
DTMF Method In-audio, RFC2833, and/or SIP Info
IP Signaling SIP (RFC 3261)
Provisioning TFTP, HTTP, HTTPS
Security SRTP, IPSEC, TLS/SIPS, HTTPS, 802.1x
Management Syslog support, HTTP and Telnet access
Dial Plan Yes
3-Way Conference 3-Way conference with local mixing
Caller ID Bellcore Type 1 & 2, ETSI, BT, NTT, FSK and DTMF-based CID
Polarity Reversal / Wink Yes
Network Connectivity IPv4, IPv6, TCP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP,
NTP, TFTP, TELNET, PPPoE, STUN
HARDWARE SPECIFICATION
The hardware specifications of the GXW4248 are detailed in Table 4.
TABLE 4: HARDWARE SPECIFICATION OF GXW4248 GATEWAY
GXW4248
Telephone Interface 2 RJ21 Ports only
FXS LEDs 48

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 15 OF 54
Network interface LAN, Single 10/100/1000 BASE-TX,RJ45
Power Input
Input
:100-240VAC, 50/60Hz
Output: 24V DC, 6.25A
LCD screen 128×32 pixel
Telco connector 2 RJ21 (50 pins)
RJ-11 connectors No
NAND Flash 64MB
DRAM 128MB (+ separate 8MB if with a slave processor)
Function Buttons 1 button for Reset/Factory Reset
Environmental Operation: 0°C to 45°C
Storage: -20°C to 60°C
Humidity: 10％to 90% Non-condensing
Mounting Desktop and Rack mount
Onhook Voltage Fixed, 48V
Ring Voltage 50Vrms (balanced ringing)
Ring Frequency 20-50Hz
Short Haul Loop 2REN, up to 6000ft on 24 AWG wire
Outdoor Protection Over-voltage Protection and surge immunity
Signaling FXS Loop-start
EMC EN55022/EN55024 and FCC part15 Class B
Safety UL
Compliance FCC, CE, C-Tick
GXW4248 LCD MENU
The GXW4248 gateway includes a small LCD screen for the display of basic information. The LCD has a
display area of 128x32 pixels, which will allow for 2 lines of text with a 16px height limitation per line.
The LCD menu is showed as Figure 3: LCD Menu. Menu is navigated by the Down-arrow and OK button.

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 16 OF 54
FIGURE 3: LCD MENU

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BASIC OPERATIONS
UNDERSTANDING GXW VOICE PROMPTS
GXW4248 has a built-in voice prompt menu for simple device configuration. To enter the voice prompt
menu, press *** on the standard analog phone connected to any FXS port.
TABLE 5: DEFINITIONS OF THE GXW VOICE PROMPTS
Menu
Voice Prompt
User’s Options
Main Menu
“Enter a Menu Option”
Enter “*” for the next menu option
Enter “#” to return to the main menu
Enter “001 – 005, 007, 010, 013 - 017, 047, 086 or 099” Menu
option
Enter “9” for confirming a option
001
“DHCP Mode”, “PPPoE
Mode ”or “Static IP Mode”
Enter ‘9’ to toggle the selection
If user selects “Static IP Mode”, user need configure all the IP
address information through menu 002 to 0
05. If user selects
“Dynamic IP Mode”, the device will retrieve all IP address
information from DHCP server aut
omatically when user reboots
the device.
002
“IPAddress “ + IP address
The current WAN IP address is announced
Enter 12-digit new IP address if in Static IP Mode.
003
“Subnet “ + IP address
Same as Menu option 002
004
“Gateway “ + IP address
Same as Menu option 002
005
“DNS Server “ + IP address
Same as Menu option 002
007
Preferred Vocoder
Enter “9” to go to the next selection in the list:
•PCM U
•PCM A
•iLBC
•G-726
•G-723
•G-729
010
“MAC Address”
Announces the Mac address of the unit.
013
Firmware Server IP
Address
Announces current Firmware Server IP address. Enter 12 digit
new IP address.
014
Configuration Server IP
Address
Announces current Config Server Path IP address. Enter 12 digit
new IP address.
015
Upgrade Protocol
Upgrade protocol for firmware and configuration update. Enter

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 18 OF 54
“9” to toggle between TFTP and HTTP
016
Firmware Version
Firmware version information.
017
Firmware Upgrade
Firmware upgrade mode. Enter “9” to rotate among the following
three options:
1. always check
2. check when pre/suffix changes
3. never upgrade
047
“Direct IP Calling”
Enter the target IP address to make a direct IP call, after dial
tone. (See “Make a Direct IP Call”.)
086
Voice Mail
Number of voice mails
099
“RESET”
Enter “9” to reboot the device; or
Enter MAC address to restore factory default setting
(See Restore Factory Default Setting section)
700-748
Phone calls between
different ports of the same
GW4248
GXW4248 support inter-port calling from voice menu for easy
test/verification in factory
“700” Ring all ports and connect to first port pick up the call
“701-748” Call individual port
“Invalid Entry”
Automatically returns to Main Menu
Five Success Tips when using the Voice Prompt
1. “*” shifts down to the next menu option
2. “#” returns to the main menu
3. “9” functions as the ENTER key in many cases to confirm an option
4. All entered digit sequences have known lengths - 2 digits for menu option and 12 digits for IP
address. For IP address, add 0 before the digits if the digits are less than 3 (i.e. - 192.168.0.26
should be key in like 192168000026. No decimal is needed).
5. Key entry cannot be deleted but the phone may prompt error once it is detected
PLACING A PHONE CALL
PHONE OR EXTENSION NUMBERS
1. Dial the number directly and wait for 4 seconds (To change the default value, modify the following
setting - “No Key Entry Timeout”)
or
2. Dial the number directly and press # (Use # as dial key” must be configured in web configuration).

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 19 OF 54
Examples:
1. Dial a number (e.g. [phone]), first enter the prefix number (usually 1+ or international
code) followed by the phone number. Press # or wait for 4 seconds. Check with your VoIP
service provider for further details on prefix numbers.
DIRECT IP CALLS
Direct IP calling allows two parties, that is, a FXS Port with an analog phone and another VoIP Device, to
talk to each other in an ad hoc fashion without a SIP proxy.
Elements necessary to completing a Direct IP Call:
1. Both GXW4248 and other VoIP Device, have public IP addresses, or
2. Both GXW4248 and other VoIP Device are on the same LAN using private IP addresses, or
3. Both GXW4248 and other VoIP Device can be connected through a router using public or private
IP addresses (with necessary port forwarding or DMZ).
GXW4248 supports two ways to make Direct IP Calling:
Using IVR
1. Pick up the analog phone then access the voice menu prompt by dial “***”
2. Dial “047” to access the direct IP call menu
3. Enter the IP address using format ex. 192*168*0*160 after the dial tone.
Using Star Code
1. Pick up the analog phone then dial “*47”
2. Enter the target IP address using same format as above.
Note: NO dial tone will be played between step 1 and 2.
Destination ports can be specified by using “*” (encoding for “:”) followed by the port number.
Examples:
a) If the target IP address is 192.168.0.160, the dialing convention is
*47 or Voice Prompt with option 047, then 192*168*0*160.
followed by pressing the “#” key if it is configured as a send key or wait 4 seconds. In this case,
the default destination port 5060 is used if no port is specified.
b) If the target IP address/port is 192.168.1.20:5062, then the dialing convention would be:

FIRMWARE 1.0.3.4 GXW4248 USER MANUAL PAGE 20 OF 54
*47 or Voice Prompt with option 047, then 192*168*0*160*5062 followed by pressing the “#”
key if it is configured as a send key or wait for 4 seconds.
CALL HOLD
Place a call on hold by pressing the “flash” button on the analog phone (if the phone has that button).
Press the “flash” button again to release the previously held Caller and resume conversation. If no “flash”
button is available, use “hook flash” (toggle on-off hook quickly). You may drop a call using hook flash.
CALL WAITING
Call waiting tone (2 short beeps) indicates an incoming call, if the call waiting feature is enabled. Toggle
between incoming call and current call by pressing the “flash” button. First call is placed on hold. Press
the “flash” button to toggle between two active calls.
CALL TRANSFER
BLIND TRANSFER
Assume that call Caller Aand B are in conversation. A wants to Blind Transfer B to C:
3. Caller A presses FLASH on the analog phone to hear the dial tone.
4. Caller A dials *87 then dials caller C’s number, and then # (or wait for 4 seconds).
5. Caller A will hear the confirm tone. Then, A can hang up.
NOTE: “Enable Call Feature” must be set to “Yes” in web configuration page.
Caller A can place a call on hold and wait for one of three situations:
1. A quick confirmation tone (similar to call waiting tone) followed by a dial tone. This indicates the
transfer is successful (transferee has received a 200 OK from transfer target). At this point, Caller
A can either hang up or make another call.
2. A quick busy tone followed by a restored call (on supported platforms only). This means the
transferee has received a 4xx response for the INVITE and we will try to recover the call. The
busy tone is just to indicate to the transferor that the transfer has failed.
3. Continuous busy tone. The phone has timed out. Note: continuous busy tone does not indicate
the transfer has been successful, nor does it indicate the transfer has failed. It often means there
was a failure to receive second NOTIFY – check firmware for most recent release.