GreaTEL GT8 User manual

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GT8 User Manual
Release 2.3

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Welcome
Welcome to the GT8 VoIP Gateway User manual. This document covers features,
functionalities, and installation procedures for the GT8 series, and provides tested
configuration examples for our gateway users. After reading this book, you will learn more
about the gateway, get familiar with the installation process, and feel more comfortable in
using the software to perform all administrative activities.
Version:
Document Version: 2.3.
Applicable Software Version: 1.9.x Series.
Copyright:
© Copyright 2007 GED. All rights reserved.

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TABLE OF CONTENTS
PRODUCT INTRODUCTION.........................................................................................................................7
Overview ...................................................................................................................................................7
Features ....................................................................................................................................................8
Hardware Platform...................................................................................................................................9
Physical...............................................................................................................................................9
System Specifications.......................................................................................................................10
PREPARATION FOR INSTALLATION.......................................................................................................11
Safety Check ..........................................................................................................................................11
Installation Environment........................................................................................................................11
Temperature/Humidity .....................................................................................................................11
Dust Control and Air Flow...............................................................................................................12
Interference and Lightening Hazard.................................................................................................12
Installing GT8...................................................................................................................................12
Inspecting GT8 and Its Accessories ...................................................................................................12
INSTALLATION..............................................................................................................................................14
Installing GT8 .........................................................................................................................................14
Connecting the Cables..........................................................................................................................14
Connecting the Ethernet Port............................................................................................................14
Connecting FXS Cable.....................................................................................................................16
Connecting FXO Cable ....................................................................................................................16
Connecting the Power Supply..............................................................................................................17
Final Checks after Installation..............................................................................................................17
FUNCTION DESCRIPTION .........................................................................................................................18
Registration.............................................................................................................................................18
Function Description of Most Used Buttons.......................................................................................19
System Configurations ..........................................................................................................................20
Software Version..............................................................................................................................21
Hardware Version.............................................................................................................................21
DSP Version.....................................................................................................................................21
RTP Port Min and Max ....................................................................................................................21
First Digit Timeout...........................................................................................................................21
Inter Digit Timeout...........................................................................................................................22
Critical Dgt Timeout.........................................................................................................................22
DTMF Mode.....................................................................................................................................22
Default Codec...................................................................................................................................22
Echo cancellation..............................................................................................................................23
Set up the Phone Numbers ..................................................................................................................23
Hardware ..........................................................................................................................................24
Prefix ................................................................................................................................................24
FXS(1~4)/ FXO(1~4).......................................................................................................................24
MGCP Setting.........................................................................................................................................25
MGCP Port.......................................................................................................................................26
Call Agent.........................................................................................................................................26
Domain Name...................................................................................................................................27
Default Packages ..............................................................................................................................27
Persistent Line Event........................................................................................................................27
Wildcard...........................................................................................................................................27
All Wildcard.....................................................................................................................................27
End-Of-Line Using...........................................................................................................................28

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Quarantine Default to Loop..............................................................................................................28
Default Package Don’t Send Name..................................................................................................28
Always Enable 1st Digit Timeout.....................................................................................................28
Onhook don’t Delete Connection.....................................................................................................28
Notify Instead of 401/402.................................................................................................................29
Using L Package Handle FXO .........................................................................................................29
Using Configured Digit Map............................................................................................................29
SIP Setting ..............................................................................................................................................29
SIP Port.............................................................................................................................................30
SIP Proxy..........................................................................................................................................30
SIP Registrar.....................................................................................................................................30
Registration Expires(s) .....................................................................................................................31
SIP Domain Name............................................................................................................................31
Authentication Mode........................................................................................................................31
User Name........................................................................................................................................31
Password...........................................................................................................................................31
Network Configuration...........................................................................................................................32
Hostname..........................................................................................................................................32
Gateway IP Address .........................................................................................................................33
DHCP ...............................................................................................................................................33
Ethernet IP Address..........................................................................................................................33
Subnet Mask.....................................................................................................................................33
Hardware Address ............................................................................................................................33
DNS..................................................................................................................................................33
DNS Primary Server.........................................................................................................................34
DNS Alternate Server.......................................................................................................................34
PPPoE...............................................................................................................................................34
Time Primary Server ........................................................................................................................34
Time Alternate Server ......................................................................................................................34
Timeout.............................................................................................................................................34
Interval..............................................................................................................................................34
Time Zone ........................................................................................................................................35
Supplementary Features ......................................................................................................................35
Setting up the Feature Keys..............................................................................................................35
Set up All Forward ...........................................................................................................................40
Set up Busy Forward ........................................................................................................................41
Set up No Answer Forward ..............................................................................................................41
Set up Fashion Ring..........................................................................................................................42
Set up Hotline...................................................................................................................................42
Dialing Plan and Routing Table ...........................................................................................................43
Set up the Dialing Plan.....................................................................................................................43
Set up the Routing Table ..................................................................................................................44
Set up the FXS Ports.............................................................................................................................51
Phone Number..................................................................................................................................52
Registration.......................................................................................................................................52
Display Name...................................................................................................................................53
Password...........................................................................................................................................53
Originating Restriction .....................................................................................................................53
Call Waiting field .............................................................................................................................53
Call Holding .....................................................................................................................................53
Call Forward.....................................................................................................................................53
Caller ID...........................................................................................................................................53
CID On Call Waiting........................................................................................................................54
Anonymous Call...............................................................................................................................54
Hotline..............................................................................................................................................54
Hotline Delay....................................................................................................................................54

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Do Not Disturb.................................................................................................................................54
Speed Dial ........................................................................................................................................54
Fashion Ring.....................................................................................................................................54
Reverse Battery.................................................................................................................................54
DDI Line...........................................................................................................................................55
Maintenance .....................................................................................................................................55
Call Control Reset ............................................................................................................................55
All Forward Number ........................................................................................................................55
Busy Forward ...................................................................................................................................55
No answer Fwd Number...................................................................................................................55
Hotline Number................................................................................................................................55
Speed Dial List .................................................................................................................................56
Fashion Ring ID................................................................................................................................56
Set up the FXO.......................................................................................................................................56
Phone Number..................................................................................................................................57
Registration.......................................................................................................................................57
Display Name...................................................................................................................................57
Password...........................................................................................................................................57
Originating Restriction .....................................................................................................................58
Hotline..............................................................................................................................................58
Dialtone ............................................................................................................................................58
Echo Cancellation.............................................................................................................................58
Detect FSK .......................................................................................................................................58
Hotline Number................................................................................................................................58
Advanced Options .................................................................................................................................58
System Advanced Options................................................................................................................58
Advanced FXO Options ...................................................................................................................62
Advanced FXS Options....................................................................................................................64
Advanced IP Options........................................................................................................................66
Advanced SIP Options......................................................................................................................72
Backup Agent Config.......................................................................................................................75
Border Proxy Config ........................................................................................................................76
EMS Optional...................................................................................................................................78
Bill Optional.....................................................................................................................................78
Log Information ......................................................................................................................................81
Call Status Information.....................................................................................................................81
Resources Information......................................................................................................................82
Message Information........................................................................................................................82
Error Information..............................................................................................................................83
Startup Information...........................................................................................................................83
Clear Message Information...............................................................................................................83
System Tools..........................................................................................................................................84
Restore Factory Setting ....................................................................................................................84
Software Update...............................................................................................................................84
Change Password..............................................................................................................................85
Restart Gateway................................................................................................................................86
Help ..................................................................................................................................................86
Exit ...........................................................................................................................................................86
APPENDIX......................................................................................................................................................87
Factory Default Settings........................................................................................................................87
Glossary ..................................................................................................................................................90
DHCP（Dynamic Host Configuration Protocol）................................................................90
DSP（Digital Signal Processing）..........................................................................................90
RTP（Real-Time Transport Protocol）..................................................................................90
DTMF（Dual Tone Multi-Frequency）....................................................................................91

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Speech CODEC ............................................................................................................................92
Echo Cancellation........................................................................................................................92
MGCP (Media Gateway Control Protocol) .............................................................................93
MGCP Call Agent .........................................................................................................................94
401/402 Response Code.............................................................................................................95
NTFY................................................................................................................................................95
SIP (Session Initiation Protocol)..............................................................................................95
Proxy.............................................................................................................................................100
Registrar.......................................................................................................................................100
Registration Expire(s)...............................................................................................................100
DNS (Domain Name System, or Service or Server）........................................................100
PPPoE（Point-to-Point Protocol Over Ethernet）............................................................100
Time Server .................................................................................................................................101
Caller ID Detecting.....................................................................................................................101
SNMP (Simple Network Management Protocol) ................................................................101
UDP Port.......................................................................................................................................102
SNMP Trap...................................................................................................................................102
NAT（Network Address Translator or Translation）.......................................................102
SDP (Session Description Protocol).....................................................................................102
STUN（Simple Traversal of UDP over NATs）..................................................................102
RADIUS（Remote Authentication Dial In User Service）...............................................103
RADIUS Server ...........................................................................................................................103
Signal Gain ..................................................................................................................................103
Line Impedance..........................................................................................................................103
Signal Mode.................................................................................................................................104
Jitter Buffer .................................................................................................................................104
RTP Payload Type .....................................................................................................................104
SID ( Silence Information Description).................................................................................104
Voice Proxy .................................................................................................................................104
Symmetric RTP...........................................................................................................................105
Kernel............................................................................................................................................105
SDP（Session Description Protocol）................................................................................105
G.723.1 Voice CODEC...............................................................................................................105
TOS (Type of Service)...............................................................................................................106
T.38 Standard Fax Protocol.....................................................................................................106
Redundancy Frame ...................................................................................................................106
V.21................................................................................................................................................106
NSF（Nonstandard facilities）...............................................................................................106
Request Line ...............................................................................................................................107
Via ..................................................................................................................................................107
Border Agent...............................................................................................................................107
RC4 Algorithm ............................................................................................................................107

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1
PRODUCT
INTRODUCTION
Overview
GT8 is a multi-purpose VoIP gateway product series designed with
the needs of service providers and enterprises in mind. With GT8
gateways, service providers can provide telephony and fax services
to subscribers using many access methods such as FTTB, HFC, and
ADSL. Enterprises can use the GT8’s traditional PBX interface to
implement voice VPN solutions with their private IP or public VPN
networks. GT8 can also serve as a remote SIP terminal for IP-PBX
solution.
GT8 has a variety of models. Each model can be customized to
have different number of FXS ports and FXO ports. It shares the
same software system as other GED’s VoIP products (GT48 and
GTT) and therefore keeps the advantages in functionality, quality,
and compatibility of GED products. In hardware GT8 uses Motorola’s
MPC852 as the Central Processing Unit, and TI C5509 high
efficiency chip to process voice and faxes. The powerful hardware
equipment ensures GT8 to send signaling and IP packets in different
channels even when traffic is at the peak, thus supports major
functions such as voice codec (G.711, G.729A, G.723.1, GSM and
iLBC) and echo cancellation.
This manual is mainly about GT8 installation and web configuration.
Please note that after you have made changes to many of the
parameters on GT8 Web Configuration page and clicked the Submit
button, you may get messages like “Submission is successful. Please

PRODUCT INTRODUCTION
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restart the system to make the changes effective.” You need to
restart GT8 using the instruction in Restart gateway.
GT8 also has the capability to restore the default settings. Just click
the Restore Default button.
GT8 configuration parameters have brief descriptions. To find out,
just point your mouse over the parameter.
Features
GT8 has the following features:
•It supports SIP/MGCP protocols
•It supports route selection (it can route a call or direct it to the
internet according to the called number)
•It supports RADIUS based CDR protocol
•It supports gain adjustment to FXS/FXO ports
•It supports the intrusion into NAT through a STUN server
•It supports traditional terminal devices, including phones, fax,
and PBX
•It supports a variety of supplementary services such as All
forward, Forward No Answer, Forward Busy Line, Call waiting,
and Distinctive Ring, etc.
•It can obtain static IP address or capture mobile IP address
through DHCP and PPPoE
•It supports the traditional fax service using T.30 and T.38
formats
•GT8 with FXO ports
•It supports the following sinaling protocols:
• SIP (Compliant to RFC 3261 and TISPAN)
• MGCP
•It supports the following codec:
• G.711
• G.723.1
• G.729A
• GSM

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• iLBC
• G.168 Echo Cancellation
• DTMF RFC2833 and T.38
Hardware Platform
Physical
Figure 0-1 GT8 Front View
①Reset button (RST)
②Power indicator (PWR). If lit, power is on
③Ethernet port indicator. If lit, it is in operation
④FXS/FXO indicators. The port number is lit
when in use
Figure 0-2 GT8 Rear View

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①Power plug-in
②10/100 baseT Ethernet port
③FXS/FXO ports, a total of 8
Table 0-1 GT8 Configuration Options
RJ11 Port Configuration
Model
Number 1 2 3 4 5 6 7 8
GT8-4S FXS1 FXS2 FXS3 FXS4 Null Null Null Null
GT8-8S FXS1 FXS1 FXS3 FXS4 FXS5 FXS6 FXS7 FXS8
GT8-/4 FXO1 FXO2 FXO3 FXO4 Null Null Null Null
GT8-4S/4 FXS1 FXS2 FXS3 FXS4 FXO1 FXO2 FXO3 FXO4
System Specifications
Table 0-2 GT8 Specification
Specification
Internal Memory 32MB
Flash Memory 4MB
On-hook Battery -56V
Off-hook Battery -24V
Ringing Voltage 60V
REN Equivalence 5 for short loop ( 1000 feet), 3 for long loop (5000
feet)
Loop Current = or > 21 mA
Loop Resistance Up to 188 Ω
Surge Voltage Level two surge protection. Can stand up to 1000V
(10/100uS) power surge
Max Line Length 1500 m
Off-hook Detection Loop Start
Dialing DTMF
Input Voltage 12V DC
Input Current 1.5Amp (Max)
Power Consumption 15Watt (Max)
Operation Temperature 0 ~ 40°C
Non Operation
Temperature –25 ~ 70°C
Operation Humidity 5 ~ 95% (Non Condensed)
Dimension (H×L×W) 300x190x45 mm
Weight 800g

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2
PREPARATION FOR
INSTALLATION
To avoid any body injury and device damage, please read this
chapter carefully before the installation.
Safety Check
Please follow the safety guidelines when installing GT8.
•Keep away from wet group and heat
•Ensure safe use of electricity
•Ensure to connect all the interface cables correctly
Installation Environment
Temperature/Humidity
The GT8 installation room must maintain normal temperature and
humidity.
If the room temperature exceeds the specified maximum temperature,
it will shorten the live of the electrical insulation material. If the room
humidity exceeds the specified humidity, GT8 may experience
electrical static shock and shrinkage of electric insulation material in
the metal package. It may also cause metal corrosion. All these will
drastically shorten the life span of the GT8. It is strongly
recommended that user control the environmental temperature

Preparation for Installation
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between 0 ~ 40ºC and humidity between 5% ~ 95% (none
condensing).
Dust Control and Air Flow
Dust falls on the GT8 might cause intermittent failure in electrical
connections. It may cause long term damage to GT8 will cause
equipment failure and shorten equipment life span. Therefore, GT8
needs to have ample air flow in front of the GT8 air intake and
outtake for proper heat exhaust.
Interference and Lightening Hazard
GT8 may experience various types of EMI hazards in operation and
its performance may be impacted. To reduce those hazards, it is
suggested that：
•Do not install GT8 close to high power wireless equipment,
RADAR transmission site, and high frequency high electric
current devices.
•GT8 comes with Level 2 lightening protection. Its operation site
requires Level 1 lightening protection.
•GT8 must have its own power source and should be electrical
interference free
•Ensure proper grounding
Installing GT8
When installing the GT8 please make sure GT8 is secured and has
ample space for air flow.
Inspecting GT8 and Its Accessories
After the installation preparation is completed, the shipping package
can be opened to examine all the items in the package. The list of
items for the GT8 is shown in Table 2 - 1.
Table 0-1 GT8 Basic Configuration and Accessories

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Model Number Qty Description
GT8-4S,GT8-8S,
GT8-/4, GT8-4S/4
1 Each GT8 may have 4 FXS ports, or 8
FXS ports, or 4 FXO ports, or 4
FXS/FXO ports. You need to examine
carefully to make sure what you receive
is what you paid for
MX-PWR10-V01-00 1 GT8 DC adaptor 12V 1.5A
MX-CBL00-0005 1 5 meter Ethernet cable, 1.5m in length
MX-CBL00-0011 1 GT8 power cord
Note：It is suggested that users carefully examine the content of
the shipping package according to the sales contract. If there is any
question or problem, please contact our customer service department.

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3
INSTALLATION
Installing GT8
Since GT8 is small, you can put it to a clean and flat workspace.
Please make sure it is secured and has ample space for air flow.
Connecting the Cables
Connecting the Ethernet Port
GT8 has one 10/100 Base-T Ethernet port with RJ45 connector. It is
equipped with LED status display. Besides voice packet, this port can
also manage, maintain, and control the information flow.
The Ethernet Cable needs to be carefully made to ensure IP data
and voice quality. The following is the Ethernet cable making
scheme:
Step1：A user can use a proper cable peeling cutter to peel away
3cm skin of a CAT-5 cable. What is left is shown in Figure 3-
1.

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Figure 0-1
Step2：Twisted pairs. Currently, the most commonly used standard
wiring scheme is EIA/TIA T568B shown in Figure 3-2. In the
wiring scheme, pin 1 and 2 are a pair, pin 3 and 6 are a pair,
pin 4 and 5 are a pair and pin 7 and 8 are a pair. According
to the Figure 3-2, twisted pairs line up with colors (1: white
orange，2: orange，3: white green，4:blue，5: white blue，
6:green，7: white brown，8: brown). It is specially noted that
the green and white green are separated by a pair of blue
wires. It is a common mistake to put green and white green
close together, which will result in interference and therefore
lower transmission efficiency.
Figure 0-2 T568B wire pairing scheme
Step3：After lining up wires to the correct pin positions, trim all the
twisted pairs with a cable cutter, leaving 15mm leads
exposed. Then follow Figure 3-3 by inserting wires to their
corresponding pin position in the plastic shell of RJ45
connector. Pin 1 will house white orange wire, etc.

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Figure 0-3 RJ 45 Wiring
Step4：After wires have been properly inserted into RJ45 connector;
a cramping tool can secure the wires to the connector and
make connections to the metal pins as shown in Figure 3-4.
Figure 0-4 Finished RJ 45
Since this is a direct connection, the connector for the other end of
the cable can be made the same way using RJ45 connector.
After the Ethernet cable is ready, Connect one end of the cable to
GT8’s WAN port and the other end to a switch or router. Check the
Ethernet status display: light or flash means activity.
Connecting FXS Cable
GT8 have FXS ports that connect to phones.
Connect one end of the RJ11 cable to the GT8 FXS port, and
connect the other end to a phone, fax, or PBX.
Connecting FXO Cable

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Certain GT8 products, like GT8-4 or GT8-4S/4, have FXO ports that
connect to PBX or PSTN.
Connect one end of the RJ11 cable to the GT8 FXO port, and
connect the other end to a PBX or PSTN line.
Connecting the Power Supply
Before plugging GT8 into the power outlet, it is suggested that tri-
phase power outlet be used and grounding be properly connected.
Please follow the procedure when connecting to the power source：
Step1：Plug the DC head of the power adaptor into GT8’s DC input
socket.
Step2：Plug the AC head of the power adaptor into the power outlet
of 110V or 220V.
Step3：Check to see if the PWR LED indicator is lit. If PWR LED is lit,
everything is normal. If not, repeat Steps 1 to 2.
Note: If power up fails repeatedly, please contact GED technical
support. Do not attempt to open GT8 to fix any problems.
Final Checks after Installation
After installing GT8 and before it is powered on, please make sure of
the following:
•There is ample air space around GT8 for heat exhaustion.
•Power cord is standard and matches the required electric
voltage.
•Make sure the ports are connected to the right devices.
Note：It is very important to recheck all the installation work to
ensure GT8 to function properly and trouble free.

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4
FUNCTION
DESCRIPTION
Registration
Step1：Power up the GT8. GT8 by default uses DHCP, and will
automatically detect an IP address; if you cannot get the IP
address (when you connect to the computer directly), use
default IP address “192.168.2.218”. After power up (when
customer line LCD stops flashing), if the gateway uses
MGCP protocol，it will tell the IP address to any first off-hook
user; if using SIP protocol, you can press “##” to get the IP
address through any customer line at any time.
Step2：Double click to open IE Explorer in the computer which is
connected to the same network as GT8.
Step3：Type in GT8 IP address（for example：192.168.2.218）
，and the web interface will display
as shown in Figure 4-1.

Function Description
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Figure 0-1 VoIP Gateway System Configurations Interface
GT8 has two levels of management：the administrator level (default
password：GTadmin) and the operator level (default password：
operator). Administrator level has higher access privilege, and is
allowed to change password for all users at all levels. Operator level
has lower access privilege, and certain options are not available
including network configurations, password management and restore
factory default settings.
GT8 allows multiple users to log on at the same time. Only the first
user logged on with highest privilege is able to change configurations.
The rest can only monitor configurations.
Note1：After a user logs on, he/she will be automatically logged
off if there is no activities for more than 10 minutes. After that, a user
needs to log on again.
Note2：After complete configuration, a user must completely log
out instead of just closing the browser. This will elevate the access
level of the next logged on user so he/she will be able to change the
configurations.
Function Description of Most Used
Buttons

Function Description
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At the bottom of each configuration page you will see two buttons:
Submit and Default.
•Submit: When you are done with configuration, click this button
once so that the configuration can be saved. After each
submission, you will be prompted by “Submission is successful.
Please restart the gateway!” You need to click OK to confirm the
action.
•Default: Click the button once to restore the factory default
setting for each parameter.
Note: Clicking this button only restore the defaults settings for the
current page. It is different from System Tools -> Restore Factory
Default in that the latter restore the default settings for the whole
system.
When the restoration is successful, you will be prompted by “The
settings are successfully restored. Please restart the gateway!” You
need to click OK to confirm the action.
System Configurations
Click System Configuration link on the left of Figure 4-1, and you will
see what is shown in Figure 4-2.
Figure 0-2 System Configuration Interface