Grandstream Networks BroadWorks BroadSoft GXW-400X User manual

Grandstream Networks, Inc.
Analog IP Gateway GXW400X
4 or 8 FXS Ports
User Manual

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GXW400X User Manual
COPYRIGHT
©2016 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.
SAFETY COMPLIANCE
The GXW400X adaptor complies with FCC/CE and various safety standards. The GXW400X power
adaptor is compliant with UL standard. Only use the universal power adapter provided with the GXW400X
package. The manufacturer’s warranty does not cover damages to the device caused by unsupported
power adaptors.
GNU GPL INFORMATION
GXW400X 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/sites/default/files/Resources/ht5xx_gpl.tar.gz.

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GXW400X User Manual
Table of Contents
CHANGE LOG................................................................................................................5
Changes from 1.0.15.5 User Manual.....................................................................................................5
Changes from 1.0.14.1 User Manual.....................................................................................................5
Changes from 1.0.13.3 User Manual.....................................................................................................5
Changes from 1.0.12.4 User Manual.....................................................................................................5
Changes from 1.0.12.1 User Manual.....................................................................................................6
Changes from 1.0.11.3 User Manual .....................................................................................................6
Changes from 1.0.10.9 User Manual.....................................................................................................6
Changes from 1.0.7.6 User Manual.......................................................................................................6
Changes from 1.0.6.8 User Manual.......................................................................................................6
GUI INTERFACE EXAMPLES........................................................................................7
WELCOME .....................................................................................................................8
Gateway GXW400X Overview...............................................................................................................8
CONNECT YOUR GXW400X GATEWAY .......................................................................9
Equipment Packaging............................................................................................................................9
Connect the GXW400X..........................................................................................................................9
GXW400X FEATURES .................................................................................................13
Software Features Overview ...............................................................................................................13
Hardware Specification........................................................................................................................13
BASIC OPERATIONS...................................................................................................15
Understanding GXW Voice Prompts....................................................................................................15
Placing a Phone Call............................................................................................................................17
Phone or Extension Numbers.......................................................................................................17
Direct IP Calls ...............................................................................................................................18
Call Hold ..............................................................................................................................................19
Call Waiting..........................................................................................................................................19
Call Transfer.........................................................................................................................................19
Blind Transfer................................................................................................................................19
Attended Transfer .........................................................................................................................20
3-Way Conferencing ............................................................................................................................20
Hunting Group......................................................................................................................................21
Inter-port Calling ..................................................................................................................................22
PSTN Pass Through/Life Line .............................................................................................................23
Sending and Receiving Fax.................................................................................................................23
Support RADIUS Protocol ...................................................................................................................23
CALL FEATURES.........................................................................................................25

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GXW400X User Manual
CONFIGURATION GUIDE ............................................................................................27
Configuring GXW400X Via Voice Prompt............................................................................................27
Configuring GXW400X with WEB BROWSER ....................................................................................28
Access the Web Configuration Menu ...........................................................................................28
Important Settings................................................................................................................................29
NAT Settings .................................................................................................................................29
DTMF Methods .............................................................................................................................30
Preferred VOCODER (Codec)......................................................................................................30
Saving the Configuration Changes ......................................................................................................66
Rebooting from Remote.......................................................................................................................67
Configuration through a Central Server ...............................................................................................67
SOFTWARE UPGRADE ...............................................................................................68
Firmware Upgrade through TFTP/HTTP/HTTPS.................................................................................68
Instructions for local firmware upgrade:...............................................................................................69
Configuration File Download................................................................................................................69
Firmware and Configuration File Prefix and Postfix ............................................................................70
Managing Firmware and Configuration File Download........................................................................70
RESTORE FACTORY DEFAULT SETTING .................................................................72
Factory Reset.......................................................................................................................................72
Reset Button ........................................................................................................................................72
IVR Command .....................................................................................................................................72
EXPERIENCING THE GXW400X .................................................................................74

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GXW400X User Manual
Table of Tables
Table 1: Definitions of the GXW Connectors...............................................................................................10
Table 2: Definitions of the GXW display panel ............................................................................................10
Table 3: Advanced definition of GXW400X LEDs patterns ......................................................................... 11
Table 4: GXW400X software features.........................................................................................................13
Table 5: Hardware specification of GXW400X series gateways .................................................................13
Table 6: Definitions of the GXW voice prompts...........................................................................................15
Table 7: Call features table (Star Code)......................................................................................................25
Table 8: Basic settings ................................................................................................................................31
Table 9: Status page ...................................................................................................................................35
Table 10: Advanced settings .......................................................................................................................38
Table 11: FXS Ports settings .......................................................................................................................47
Table 12: Profile settings .............................................................................................................................50
Table of Figures
Figure 1: Diagram of GXW4004-8 back panel ..............................................................................................9
Figure 2: Diagram of GXW4004-8 display panel ........................................................................................10

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GXW400X User Manual
CHANGE LOG
This section documents significant changes from previous versions of GXW400X user manuals. Only major
new features or major document updates are listed here. Minor updates for corrections or editing are not
documented here.
Changes from 1.0.15.5 User Manual
Added option to disable PnP subscribe feature [3CX Auto Provision]
Added option "DNS SRV use Registered IP" to control destination IP address for outbound request
under SRV mode [DNS SRV use Registered IP]
Split Layer 3 QoS into SIP and RTP [Layer 3 QoS]
Deactivated SIP INFO DTMF in SIP accept header. Added option "DTMF-RELAY Tag Respect SIP
INFO" [DTMF-RELAY Tag Respect SIP INFO]
Added configurable option to enable/disable Broadsoft Connected Line ID [Disable Connected Line ID]
Added TLS/SSL certificate domain and chain validation [Authenticate Server Certificate Domain]
Updated LED light patterns to match HT70x’s [Advanced definition of GXW400X LEDs patterns]
Changes from 1.0.14.1 User Manual
Bugs fixed with no new feature added.
Changes from 1.0.13.3 User Manual
Added feature [Hold Target Before Refer] in profile settings, which allows user to hold or not hold the phone
call before refer.
Added feature [Crypto Life Time] in profile settings, which allows user to enable or disable Crypto life
time when using SRTP.
Added feature [Play busy/reorder tone before Loop Current Disconnect] in profile settings, which allows
user to configure if it will play busy/reorder tone before loop current disconnect upon call fail.
Changes from 1.0.12.4 User Manual
Added option [SIP Timer D] to configure RFC 3261 timer D in Advanced Settings.
Changed option name from [Allow DHCP Option 66 to override server] to [Allow DHCP Option 66 or 160
to override server]. Now option160 will be accepted by unit along with option 66 when enabled.
Added feature [Download Device XML Configuration] in advanced settings, which allows user to
download device configuration to local directory in xml format.
Added feature [Upload firmware] in advanced settings, which allows user to upload firmware file from
local directory.
Added feature [Upload configuration] in advanced settings, which allows user to upload configuration
file from local directory.

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GXW400X User Manual
Changes from 1.0.12.1 User Manual
Added the options to enable/disable [Always send HTTP Basic Authentication Information]
Added the options to restrict the m field sent in SDP [Disable Multiple m line in SDP]
Changes from 1.0.11.3 User Manual
Added the options to enable/disable [Do Not Escape '#' as %23 in SIP URI]
Added network whist/black list function on WAN port [White list for WAN side] [Black list for WAN side]
Changes from 1.0.10.9 User Manual
Added the options to enable/disable [Use P-Preferred-Identity Header] and [Use Privacy Header]
Added the option to enable/disable [Add Auth Header On Initial REGISTER]
Changes from 1.0.7.6 User Manual
Added option to enable/disable SIP NOTIFY Authentication. [Disable SIP NOTIFY Authentication]
Added option [Use Configured IP ] in DNS mode. Added configurable parameter [Primary IP][Backup
IP1][Backup IP2]
Added option to set [Reregister before Expiration]
Added option [Use Request Routing ID in SIP INVITE Header] to allow user to replace From and Contact
headers for outgoing calls by [Request URI Routing ID]
Added field [Request URI Routing ID] to allow device to route the calls to individual fxs ports based on
the Request URI user ID in the incoming INVITE.
Changes from 1.0.6.8 User Manual
Added the option to enable/disable hook flash. [Enable Hook Flash]
Added two CPE SSL configuration [CPE SSL Certificate][CPE SSL Private Key]
Added a configuration parameter to set the [Connection Request Port]
Removed DHCP Domain from Web UI
Removed Enable Ring-transfer from Web UI
Added a configuration parameter to set the [Offhook Auto-Dial Delay]
Changed the SSL Web UI description to [SIP TLS Certificate][SIP TLS Private Key] and [SIP TLS Private
Key Password]

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GXW400X User Manual
GUI INTERFACE EXAMPLES
http://www.grandstream.com/sites/default/files/Resources/gxw400x_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 1 Configuration Page
5. Screenshot of Profile 2 Configuration Page
6. Screenshot of Status Page

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GXW400X User Manual
WELCOME
Thank you for purchasing the Grandstream GXW400X Analog FXS IP Gateway. The GXW400X offers an
easy to manage, easy to configure IP communications solution for any business with virtual and/or branch
locations. The GXW400X 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 GXW400X Overview
The new GXW400X series has a compact and quiet design (no fans) and offers superb audio quality, rich
feature functionality, strong security protection, and good manageability. It is auto-configurable, remotely
manageable and scalable.
The GXW400X features 4 or 8 port FXS interface for analog telephones, dual 10M/100Mbps network ports
with integrated router, PSTN life line in case of power failure, and an RS232 serial for administration. In
addition, it supports the option of 3 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(16/24/32/48 bit rates), G.729A/B/E and iLBC.

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GXW400X User Manual
CONNECT YOUR GXW400X GATEWAY
Connecting the GXW400X gateway is easy. Before you begin, please verify the contents of the GXW400X
package.
Equipment Packaging
Unpack and check all accessories. Equipment includes:
one device unit
one RJ45 Ethernet cable
one 12V universal power adapter
Connect the GXW400X
Follow these four (4) steps to connect your GXW400X gateway to the Internet and access the unit’s
configuration pages.
1. Connect standard touch-tone analog phones to the FXS ports.
2. Insert an RJ45 Ethernet cable into the WAN port of GXW400X and connect the other end to an
uplink port (a router or a modem, etc.) Note: If the gateway is used in router mode, connect a PC
to the LAN port of GXW400X for initial configuration.
3. Plug the power adapter into the GXW400X gateway into a power outlet.
Follow the instructions from the topic “Configuring GXW 400X with Web Browser” for initial configuration.
The GUI pages will guide you through the remaining steps to set-up your gateway. Examples of the GUI
Interfaces can be downloaded from:
http://www.grandstream.com/sites/default/files/Resources/gxw400x_gui.zip.
Figure 1: Diagram of GXW4004-8 back panel
LAN/WAN
RJ-45 Ethernet
Ports
FXS
Ports
Console
Connection
(PC
connection)
GXW 400x
PSTN
Line
Power
Supply
Reset

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GXW400X User Manual
Table 1: Definitions of the GXW Connectors
LAN
Connect the LAN port with an Ethernet cable to your PC.
WAN
Connect to the internal LAN network or router.
RESET
Factory Reset button. Press for 7 seconds to reset factory default settings.
DC 12V
Power adapter connection
CONSOLE
Console connection for a PC.
LINE
When the unit loses power or unit became unregistered, FXS port 1 will be able to
make/receive calls from the PSTN line connected to this port.
FXS1 – FXS8
FXS port to be connected to analog phones / fax machines.
Note: Once the GXW400X is turned on and configured, the front display panel indicates the status of the
unit.
Figure 2: Diagram of GXW4004-8 display panel
Table 2: Definitions of the GXW display panel
Power LED
Indicates Power. Remains ON when Power is connected and turned ON.
Ready LED
Remains ON after boot-up.
Console
Turns ON when Console port is being used.
LAN LED
Indicates LAN (or WAN) port activity
WAN LED
Indicates PC (or LAN) port activity
LED 1–8
Indicate status of the respective FXS Ports on the back panel
Unregistered – OFF
Registered and Available – ON (Solid Green)
Off-Hook / Busy – Blinking every second
Slow blinking FXS LEDs indicates voicemail
NOTE: All LEDs display green when ON
FXS port
status
GXW4008
Display
LEDs

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GXW400X User Manual
Table 3: Advanced definition of GXW400X LEDs patterns
LED-01
Device has normal power
Power
ON
LED-02
Power Error: Power is removed from the device or
power supply with improper voltage is plugged in
Power
OFF
LED-03
Line X is registered normally to the sip providers
network and is ready to make a call
Phone
ON
LED-04
Voice mail waiting for Line X
Phone
1sec ON / 3sec OFF
LED-05
Device has normal WAN connection and has obtained
IP address
Internet
ON
LED-06
Internet link error: Device is powered up and ready to
connect to the Internet but the WAN/INTERNET port
is down
Internet
OFF
LED-07
Internet DHCP Error: Device is properly connected
but it is unable to retrieve an IP address from the
device it is connected to
Internet
250ms ON/ 250ms
OFF
LED-08
Line Registration failed: Device is properly setup,
can connect to provider's network, but cannot register
to provider's SIP proxy (no 200 OK)
Phone
2x1000ms ON/OFF
+
3sec OFF
LED-09
Device is connected (has physical data link) but there
are incorrect network settings typically associated
with PPPoE connection failure
Internet
250ms ON/ 250ms
OFF
LED-10
Hazardous potential test failed: Hazardous AC or DC
voltage is present on the tip and ring or both signals
of phone line X
Phone
1x250ms ON/OFF
+
3sec OFF
LED-11
Foreign electro Motive Force (EMF) Test fail. Foreign
voltage is present on the tip, ring or both signals of
phone line. Device has detected additional external
Phone voltage on the FXS phone line.
Phone
2x250ms ON/OFF
+
3sec OFF
LED-12
Resistive fault test failed. Either tip or ring is shorted
to ground or they are shorted to each other.
Phone
3x250ms ON/OFF
+
3sec OFF
LED-13
Receiver off hook test fail. One or more phones are off
hook on phone line during test.
Phone
4x250ms ON/OFF
+
3sec OFF
LED-14
REN test failed – high REN detected. Too many
parallel phones connected to phone line X
Phone
5x250ms ON/OFF
+

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GXW400X User Manual
3sec OFF
LED-15
Line is active
Phone
500ms ON/OFF
LED-16
Line inactive
Phone
ON
LED-17
During Provisioning Stage*
Internet /
Phone
500ms ON/OFF
LED-18
During Firmware Recovery Stage*
Internet /
Phone
250ms ON/OFF
LED-19
Line X is registered normally to the sip providers
network and is ready to make a call
Phone
2x1000 ms ON/OFF
+
3sec OFF

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GXW400X User Manual
GXW400X FEATURES
The GXW4000 series is a next generation IP voice gateway that is interoperable and compatible with
leading IP-PBXs, Softswitches and SIP platforms. The GXW4000 series FXS gateway is auto-configurable,
remotely manageable and scalable. The GXW4000 series gateways come in two models - the GXW-4004
and GXW-4008, each offering superb voice quality, traditional telephony functionality, easy deployment,
and 4 and 8 FXS ports respectively. Each model features flexible dialing plans, integrated call routing to
support a pure IP network call and an external power supply.
Software Features Overview
4 or 8 FXS ports
Two RJ-45 ports (switched or routed)
Multiple SIP accounts & profiles (4,8 / configurable through 2 profiles)
Supports Voice Codecs:
oG711(a/µ, Annex I & II), G723.1A, G726 (ADPCM with 16/24/32/40 bit rates), G729 A/B/E,
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 4: GXW400X software features
GXW4004
GXW4008
Telephone Interfaces
4 FXS ports
8 FXS ports
SIP Provisioning
4 SIP accounts, 2 profiles
8 SIP accounts, 2 profiles
Network Interface
Two (2) 10M/100 Mbps, RJ-45
Two (2) 10M/100 Mbps, RJ-45
Number of Concurrent
Calls (except when using
SRTP)
4 Concurrent Calls
8 Concurrent Calls
Voice over Packet
Capabilities
Voice Activity Detection (VAD)
with CNG (comfort noise
generation) and PLC (packet loss
concealment), AEC with NLP
Packetized Voice Protocol Unit
Voice Activity Detection (VAD) with
CNG (comfort noise generation)
and PLC (packet loss
concealment), AEC with NLP
Packetized Voice Protocol Unit

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GXW400X User Manual
(supports RTP and AAL2
protocol), G.168 compliant Echo
Cancellation, Dynamic Jitter
Buffer, Modem detection & auto-
switch to G.711
(supports RTP and AAL2 protocol),
G.168 compliant Echo
Cancellation, Dynamic Jitter Buffer,
Modem detection & auto-switch to
G.711
PSTN Fail-over
PSTN failover port on power
failure
PSTN failover port on power failure
Voice Compression
G.711 + Annex I (PLC), Annex II
(VAD/CNG format) encoder and
decoder, G.723.1A,
G.726(ADPCM with 16/24/32/40
bit rates), G.729A/B/E, 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
G.711 + Annex I (PLC), Annex II
(VAD/CNG format) encoder and
decoder, G.723.1A, G.726(ADPCM
with 16/24/32/40 bit rates),
G.729A/B/E, 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
Yes, NAT Router or Switched
Mode
Yes, NAT Router or Switched Mode
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.19, V.27ter,
V.29 for T.38 fax relay
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.19, V.27ter,
V.29 for T.38 fax relay
QoS
Diffserv, TOS, 802.1 P/Q VLAN
tagging
Diffserv, TOS, 802.1 P/Q VLAN
tagging
Transport Protocol
RTP
RTP
DTMF Method
In-audio, RFC2833, and/or SIP
Info
In-audio, RFC2833, and/or SIP Info
IP Signaling
SIP (RFC 3261)
SIP (RFC 3261)

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GXW400X User Manual
Provisioning
TFTP, HTTP, HTTPS
TFTP, HTTP, HTTPS
Control
TLS/SIPS
TLS/SIPS
Management
Syslog support, HTTP and Telnet
access
Syslog support, HTTP and Telnet
access
Dial Plan
Yes
Yes
UPnP Support
Yes
Yes
Caller ID
Bellcore Type 1 & 2, ETSI, BT,
NTT, and DTMF-based CID
Bellcore Type 1 & 2, ETSI, BT, NTT,
and DTMF-based CID
Polarity Reversal / Wink
Yes
Yes
EMC
EN55022/EN55024 and FCC
part15 Class B
EN55022/EN55024 and FCC part15
Class B

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GXW400X User Manual
Hardware Specification
The hardware specifications of the GXW FXS series are detailed in Table 4.
Table 5: Hardware specification of GXW400X series gateways
GXW4004
GXW4008
Ports
4 FXS Ports
8 FXS Ports
Network interface
1 RJ45 for LAN, 10/100 Base-TX,
Full Duplex
1 RJ45 for WAN,10/100Base-
TX, Full Duplex
1 RJ45 for LAN, 10/100 Base-TX,
Full Duplex
1 RJ45 for WAN,10/100Base-
TX, Full Duplex
PSTN Port
PSTN fail-over port
PSTN fail-over port
Console
DB9 Serial port
DB9 Serial port
Universal Switching
Power Adaptor
Input: 100-240V AC, 50/60Hz,
0.3A Max
Output: 12V DC, 1.25A
UL certified
Input: 100-240V AC, 50/60Hz, 0.3A
Max
Output: 12V DC, 1.25A
UL certified
Short Haul Loop
2REN: Up to 1km on 24 AWG wire
2REN: Up to 1km on 24 AWG wire
Mounting
Wall mount, Desktop
Wall mount, Desktop
Dimension
225mm (L) x 135mm (W) x 35mm
(H)
225mm (L) x 135mm (W) x 35mm
(H)
Weight
0.29 lbs (3.5 oz)
0.29 lbs (3.5 oz)

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GXW400X User Manual
Temperature
32~104°F / 0~40°C
32~104°F / 0~40°C
Humidity
10% - 90% (non-condensing)
10% - 90% (non-condensing)
Safety
UL
UL
Compliance
FCC, CE
FCC, CE

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GXW400X User Manual
BASIC OPERATIONS
Understanding GXW Voice Prompts
GXW400X 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 6: 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 01 – 05, 07,10 - 17, 47, 86 or 99 Menu option
01
“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 02 to 05. If user
selects “Dynamic IP Mode”, the device will retrieve all IP
address information from DHCP server automatically when
user reboots the device.
02
“IP Address “ + IP
address
The current WAN IP address is announced
Enter 12-digit new IP address if in Static IP Mode.
03
“Subnet “ + IP address
Same as Menu option 02
04
“Gateway “ + IP address
Same as Menu option 02
05
“DNS Server “ + IP
address
Same as Menu option 02

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GXW400X User Manual
07
Preferred Vocoder
Enter “9” to go to the next selection in the list:
PCM U
PCM A
iLBC
G-726
G-723
G-729
10
“MAC Address”
Announces the Mac address of the unit.
12
WAN Port Web Access
Enter “9” to toggle between enabled and disabled
13
Firmware Server IP
Address
Announces current Firmware Server IP address. Enter 12
digit new IP address.
14
Configuration Server IP
Address
Announces current Config Server Path IP address. Enter
12 digit new IP address.
15
Upgrade Protocol
Upgrade protocol for firmware and configuration update.
Enter “9” to toggle between TFTP and HTTP
16
Firmware Version
Firmware version information.
17
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
47
“Direct IP Calling”
Enter the target IP address to make a direct IP call, after
dial tone. (See “Make a Direct IP Call”.)
71-78
Phone calls between
different ports of the
same GW 400x
Applies to GXW4004/GXW4008. User can make internal
calls between different ports inside the same GW even
without being registered to SIP server. By dialing *** and 7x