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General
Questions
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Q37:
If
we use VoIP Gateway under NAT Router, what is the TCP/IP port number
required? (2005/6/28)
Q36:
How
to setup VoIP Gateway? (2003/7/10)
Q35: What
is Dial Plan and how to setup? (2003/7/10)
Q34: How
to setup VoIP Gateway to work with Gate Keeper? (2003/7/10)
Q33: How
to setup VoIP Gateway to work behind NAT Router? (2003/7/10)
Q32: Can
I use VoIP Gateway with Dynamic IP and how to setup it? (2003/7/10)
Q31: How
to debug VoIP system? (2003/7/10)
Q30: How
to download VoIP system new firmware? (2003/7/10)
Q29:
What
is the line impedance of FXO interface?
(2003/7/10)
Q28: We
use Cisco call manager v3.1 and have problem of "False answer
supervision"?
Q27: Does
the VoIP Gateway support Voice Detection?
Q26: Does
the VoIP Gateway support Polarity Reversal?
About
VoIP Internet Telephone Gateway [ITG]
Q25: What
is Gateway?
Q24: What
is Internet telephone?
Q23: What
are the differences between Internet telephony and traditional POTS
telephone?
Q22: How
is the voice quality of Internet telephony Gateway?
Q21: What
is Internet Telephony Gateway (ITG)?
Q20: What
kind of call control protocols does ITG support?
Q19: What
kind of voice codec does ITG support?
Q18: What
kind of telephony interfaces does ITG support?
Q17: Does
ITG support Fax?
Q16: Does
ITG need another PC or Server to handle the call?
Q15: How
can I call my customer who doesnt have ITG?
Q14: What
is bandwidth requirement of ITG?
Q13: What
is the ITG product family?
Q12: What
kind of memory does ITG have?
Q11: How
can I upgrade ITG?
Q10: How
can I configure ITG?
Q09: Is
there any security mechanism built in ITG?
About ITG Dial Plan Settings
Q08: What
is Dial Plan?
Q07: How
many phone numbers can I set in the ITG Dial Plan?
Q06: How
can I tell the number is valid when I make a call?
Q05: EUSSO Technologies, Inc.Does
ITG support hunt Group function?
About Interoperability test
Q04: Is
ITG interoperable with other gatekeepers?
Q03: Is
ITGEUSSO Technologies, Inc. interoperable with other gateways?
Q02: Does
ITG support NetMeeting?
Q01: Can
we make a VoIP call to another gateway with a virtual IP under NAT
Router?
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Q37:
If
we use VoIP Gateway under NAT Router, what is the TCP/IP port
number
required? Standard
VoIP port tcp 1720 is required for most broadband router.But
some of the NAT router is not enough to open tcp 1720 port for
Voice communicaiton.
In
such case, udp 30000 to udp 30100 port is required to open for
VoIP gateway.
To totally avoid VoIP gateways packets to be blocked by NAT
router, there are 2 solutions:
1.Install the VoIP gateway at the WAN side, setup with public IP
address for communication.
2.Use
NAT Routers DMZ function to make VoIP Gateway under DMZ device
for voice communication.
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Q36:
How
to setup VoIP Gateway? (2003/7/10)
VoIP
Gateway is an interface device between Internet (Ethernet network)
and Telephone network.
You
need telephone or telephone exchanger and Ethernet (router to
Internet) to talk by phone but through IP network. Please see
file for detail setup.
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Q35:
What is Dial Plan and how to setup? (2003/7/10)
Dial
Plan is a database resides in flash memory of VoIP Gateway and it
consists of three tables:
A.
Address Table
B. Hunt group table
C. Destination table
Please
see file
for detail setup.
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Q34:
How to setup VoIP Gateway to work with Gate Keeper?
(2003/7/10)
Please
see file
for detail setup.
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Q33:
How to setup VoIP Gateway to work behind NAT Router?
(2003/7/10)
Basically
the VoIP Gateway supports NAT Router (Broadband Router).
You need to setup an IP address to map to WAN, and open the ports
that VoIP need.
On the VoIP Gateway, please enable the support to NAT Router
feature.
Please
see file
for detail setup.
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Q32:
Can I use VoIP Gateway with Dynamic IP and how to setup it?
(2003/7/10)
Yes,
you can use the VoIP Gateway with dynamic IP Internet connection.
But
you still need to register a domain name to use. It is possible to
get a domain name service with your dynamic IP which is so-called
Dynamic DNS. Please see
file for detail setup.
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Q31:
How to debug VoIP system? (2003/7/10)
Please
see file
for detail setup.
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Q30:
How to download VoIP system new firmware? (2003/7/10)
Please
see file
for detail setup.
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Q29:
What is the line impedance of FXO interface? (2003/7/10)
The
factory default setting of FXO interface is 600 ohm.
There are total 10 types of line impedance can be supported and can
be changed by command.
Console>tel show tel_id
tel_id
Line characteristic
-------
-------------------
1
600 ohms
2
900 ohms
3
220+820//115nF (Germany)
4
200+680//100nF (China)
5
370+620//310nF (UK)
6 180+910//150nF
(France)
7
270+750//150nF (Sweden)
8
120+820//110nF (Norway)
9
150+830//72nF
(Belgium)
10
400+500//330nF (Denmark)
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Q28:
We
use Cisco call manager v3.1 and have problem of "False answer
supervision"?
The
Cisco Call Manager v3.1 is a Gate Keeper and it works with our VoIP
Gateways.
There
is a known problem that is "False Answer Supervision" it
means that call manager don't know when the called party answer the
phone. It immediately starts to count the duration.
The
solution can be as follows:
There is different for FXO and FXS in response of the H.323 connect
signal.
FXS connect to Telephone set directly, it response connect signal
when user pick up phone. Then start to bill accounting. FXO connect
to PBX or PSTN system, it response connect signal when FXO detect
connected with PBX. So it is almost like you start to dial but start
to billing accounting.
The solution is only to set delay time of valid_call_timer of FXO
port. For example 30 seconds. It is not exactly as you want to
response connect signal when called partner pick up phone. But the
process almost closes its result, As:
1. When called party pick up phone within 30 seconds, it sends back
connect signal at that time,
meet the time to start billing.
2. If the called party not pick up phone within 30 seconds, it will
time out and disconnect the call,
without billing.
The command for this is:
set port <port> fxo valid_call_timer <value in msec>
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Q27:
Does
the VoIP Gateway support Voice Detection?
Yes,
the VoIP Gateway supports Voice Detection. There are two commands
used to set Voice detection.
set
coding profile_id vad
This
command is used to enable/disable the Voice Activity Detector (VAD)
for a coding profile.
set
coding profile_id vad_thresh
This
command is used to set threshold level for the VAD for a coding
profile.
The
threshold Value in dBm, ranging from 20 to +10.
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Q26:
Does
the VoIP Gateway support Polarity Reversal?
Yes,
the VoIP Gateway supports Polarity Reversal. The ITG incorporates
battery reversal detector on the FXO interface. After detecting
battery reversal signal on a FXO port for certain times, the ITG
shuts down the port. This command is used to specify the number of
times the battery reversal signal must be detected before the ITG
shutting down a FXO port. The command to set the count of polarity
Reversal count as follows:
set
port port fxo batt_rev_times count
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Q25:
What is Gateway?
A
device that interconnects networks with different, incompatible
communication protocols. For example, IBM SNA and PC Windows is
using different protocols and need SNA Gateway for communication;
The public telephone service and Internet service is using different
protocol and also need VoIP Internet Telephone gateway for
communication.
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Q24:
What is Internet telephone?
Internet
telephone is a revolutionary product that allows you to make
real-time, two-way conversations over the Internet. You can talk to
another Internet telephone users anywhere in the world for the cost
of a local call to your Internet Service Provider (ISP) or Internet
Telephony Service Provider (ITSP).
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Q23:
What are the differences between Internet telephony and traditional
POTS telephone?
Internet
telephony follows an architecture that is obviously different from
that for POTS which provides a voice call only through the circuit
switched network. Internet Telephony utilizes packet
technology. These packets are sent out on the Internet. Each packet
is encoded with an address, and reaches its destination
independently. Packets are regrouped at the destination point, and
are converted back into regular voice over telephone lines. Internet
telephony allows much more information to be sent over Internet than
circuit-switched networks.
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Q22:
How is the voice quality of Internet telephony Gateway?
It
is no more a puff for Internet telephone to provide toll-quality
voice service. To achieve this goal, most Internet telephony servers
use the industry standard and high quality voice coders including
G723.1, G729A and advanced voice compression/decompression
technology to deliver high quality Voice over IP (VoIP) services.
ITG Voice quality is determined primarily by three major factors,
delay, packet loss, and jitter. That is, the lower the delay, the
less the packet loss and the smaller the jitter, and the better the
voice quality. The low delay, packet loss and jitter simply require
sufficient Internet bandwidth between the originating and
destination gateways.
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Q21:
What is Internet Telephony Gateway (ITG)?
The
Internet Telephony Gateway (ITG) is the linkage between PSTN and
Internet, is a cost-effective and highly reliable analog Voice over
IP (VoIP) Gateway that offers toll quality voice and real-time fax
data over IP networks. With its embedded architecture, the gateway
is ideal for VoIP applications associated with Remote Office and
Branch Office (ROBO) environments. With its built-in user-friendly
interface, the gateway may be installed easily and conveniently to
yield immediate cost savings. Depending on the model type, The
Internet Telephony Gateway supports multiple voice or Fax
communications simultaneously.
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Q20:
What kind of call control protocols does ITG support?
ITG
support ITU-T's H323 V2 call control protocol currently.
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Q19:
What kind of voice codec does ITG support?
ITG
supports G723.1, G711 and G729 AB voice codec. ITG also support T.30
and T.38 Fax.
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Q18:
What kind of telephony interfaces does ITG support?
ITG
supports:
1.Loop
Start Foreign Exchange Office (FXO)- for connecting ITG to either
PBXs extension lines or central office line.
2.Loop
Start Foreign Exchange Station (FXS)- for connecting ITG to PBXs
trunk lines, key telephony system, telephone sets or fax machines.
3.E&M
(Type V, 4 Wire) - for connecting ITG to PBX, Supporting immediate,
wink and delay start.
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Q17:
Does ITG support Fax?
Yes,
ITG supports T.38 and T.30 Fax. Just need to make sure the fax codec
used (T.38 to T.30) are the same at the both end of ITGs, then it
works.
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Q16:
Does ITG need another PC or Server to handle the call?
We
can use one ITG making calls to the other ITG directly, without
the need of any Gatekeeper to process the call control. Of course,
ITG also can be managed by a H323 Gatekeeper for call control
management.
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Q15:
How can I call my customer who doesnt have ITG?
We
may call the customer by NetMeeting through ITG without changes. We
also may call through ITSP who can provide VoIP service to our ITG.
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Q14:
What is bandwidth requirement of ITG?
The
bandwidth requirement is related to the coder used and overhead
associated with the IP packets. Our ITG support three kinds of voice
codec, G723.1 takes about 12 Kbps per channel, G729A/AB takes around
15 Kbps per channel, G711 takes about 100 Kbps per channel. T.38 fax
takes around 28 Kbps per channel.
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Q13:
What is the ITG product family?
ITG
has the following product family:
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Model
Number
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Description
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UTG7102-S
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Desk top 2 port gateway with FXS interface
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UTG7104-22
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Desk top 4 port gateway with 2 port FXS and 2 port FXO
interface
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UTG7104-O
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Desk top 4 port gateway with 4 port FXO interface
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UTG7104-S
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Desk top 4 port gateway with 4 port FXS interface
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UTG7108-C
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19 Rack mount main module with housing and Power supply,
(must equip with Line module to work and may accommodate up to 8
port. Also can work with both FXS and FXO interfaces)
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UTG7108-O
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One 4-Port FXO line module, must work with UTG7108-C
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UTG8104-S
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One 4-Port FXS line module, must work with
UTG7108-C |
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Q12:
What kind of memory does ITG have?
There
are 4M Flash Memory in ITG. This flash memory not only stores
ITGs application program, but also stores all the phone number
that users may dial.
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Q11:
How can I upgrade ITG?
We
can use TFTP to update application program into ITG flash memory.
The procedure is as follows:
1. Turn on your TFTP server first, and setup the suitable TFTP
server root directory.
2. Make sure your PC (or NoteBook) and the target ITG are in the
same IP segment.
3. Connect RS232 cable between your PC (or NoteBook) and the target
ITG.
4. Use VT-100 hyper terminal emulation program.
5. Type Download command for download mode.
6. For more information, please refer User Manual Chapter 9.
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Q10:
How can I configure ITG?
ITG
can be configured by Http, telnet, or console port.
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Q09:
Is there any security mechanism built in ITG?
When
someone intent to login-in ITG by Http mode or Telnet mode, the
username and password verification are required. It also can
open/close HTTP and Telnet if it is necessary.
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Q08:
What is Dial Plan?
The
dial plan is a database built in the ITG for the ATPM function
(Address Translation and Parsing Manager) to map telephony numbers
to the IP address associated with remote ITGs. The dial plan
consists of the address table, hunt group table and the destination
table. Users need to setup these tables according to the steps
specified in the User's Manual, so that the ITG would setup calls
with remote ITGs appropriately.
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Q07:
How many phone numbers can I set in the ITG Dial Plan?
Each
table (Address Table, Hunt Group Table and Destination Table) can
have up to 100 entries.
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Q06:
How can I tell the number is valid when I make a call?
We
may dial the desired destination phone number from the telephone
set. If the desired destination phone number is valid, the ITG will
play two quick address ack tones, Du Du, to destination. If the
desired destination phone number is not valid, the ITG will play
three quick out of service tones.
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Q05:
Does ITG support hunt Group function?
We
may define several destinations (ports or ITGs) as one hunt group in
one ITG. Whenever one of the ports is busy, ITG may forward this
call to other available ports belonging to the same hunt group.
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Q04:
Is ITG interoperable with other gatekeepers?
We
completed the interoperability tests with various gatekeepers.
1.
Clarent GK
2. Cisco GK
3. Intel Dialogic GK
4. Radvision GK
5. Lucent GK
MediaRing
VoizeRouter
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Q03:
Is ITG interoperable with other gateways?
We
have completed testing with many other Internet Telephony Gateway.
Press
ITG / Gateway Interoperability Test report to see the listing.
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Q02:
Does ITG support NetMeeting?
Yes,
ITG supports NetMeeting.
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Q01:
Can we make a VoIP call to another gateway with a virtual IP under
NAT Router?
Yes,
ITG may support virtual IP under NAT router application.
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EUSSO
Technologies, Inc. is a dedicated data communication and networking
company. With professional experiences in design, production,
marketing and service support, we deliver the full range networking
products including Gigabit Ethernet, Fiber Optic, Wireless LAN,
Switches, Hubs, LAN cards, PCMCIA adapters, Converter, Transceivers.
As well as Internet Telephony Gateway, Print Servers, Broadband Router
and many others.
Copyright
EUSSO Technologies, Inc. 2003
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UTG7104