Preguntas
más frecuentes
What
is VoIP?
VoIP, or "Voice
over Internet Protocol" refers to sending voice and fax phone
calls over data networks, particularly the Internet. This technology
offers cost savings by making more efficient use of the existing network.
What is IP Telephony?
IP Telephony
is the technology of transmitting voice and fax over data networks
using the Internet Protocol (IP). This technology offers new capabilities
and enormous cost savings by taking advantage of the intelligence
and more efficient use of the network. This creates the potential
for new opportunities and services.
What is an VoIP Gateway?
An VoIP Gateway
allows Internet telephone calls to be sent onto the PSTN by taking
voice by converting circuit-switched calls onto the packet-switched
network and back again. This allows a person at a PC to call any telephone
number served by the gateway. VoIP gateways take voice (or even a
fax transmission) from the circuit-switched PSTN and place it on the
packet-switched Internet and vice versa. The cost elements in PC-to-phone
calls are the cost of connecting from the PC to the local ISP and
the cost of connecting from the VoIP Gateway at the endpoint to the
phone at the final destination. In most cases, the connections from
the gateways to the calling party's are local phone calls. Since the
charge for the long distance transmission is going out over the Internet
the cost of the call is minimal.
How does
traditional phone service work?
The traditional
telephone network often referred to as the Public Switched Telephone
Network (PSTN) and uses circuit switched technology to transmit calls.
A dedicated connection or circuit is created that connects two parties.
When a phone is dialed there is a dedicated path created from the
users phone system to the call recipient. The PSTN network provides
real-time transmission with a guaranteed quality of service level
ensured by a dedicated circuit shared on the telephone call. The circuit
is not used efficiently because it is dedicated throughout the duration
of the phone call but most conversations are largely made up of silence,
so the circuit while in use is not actually transmitting anything.
How does VoIP work?
VoIP is different
from the PSTN because it does not use dedicated circuits; multiple
users share networks. Information is transmitted over the network
in packets and the network is often referred to as a packet-switched
network. This is extremely efficient because the network is only used
when it is transporting packets of information. When using an IP network
to transmit voice, issues such as the speed of the Internet connection,
other traffic on the Internet, latency (the delay that takes place
from the time someone speaks till the time the other person can hear
them), and the delays or loss of the transmittal of packets that lowers
the quality of the voice conversation need to be addressed. The billing
mechanism for VoIP is based on the amount of bandwidth used or dedicated.
What kind of quality can I expect from Internet or IP Telephony?
It depends on
two primary factors, the amount of bandwidth available and the IP
Endpoint connected (whether there are additional components that are
providing processing power to improve the connection). Most people's
initial introduction to PC Telephony is through dial-up Internet accounts
that offer "narrow" bandwidth. This users experience ranges
of quality depending upon the amount of traffic on the net, and bandwidth
limitations that can lead to packet loss, latency and jitter. This
shows up as a clipped effect with gaps of speech or garbled sound.
Specially designed products with sophisticated electronic components
that provide additional processing power to address these technological
shortcomings can dramatically improve these problems. All of the leading
ITSP's are introducing Broadband solutions that offer bandwidth that
supports high quality telephone calls. Coupled with the appropriate
interface devices, these calls are indistinguishable from a traditional
telephone call.
Is VoIP right for my company?
Medium to large
multinational corporations will see the most savings, as they typically
have both the network in place and the voice volume to effectively
use VoIP service. A company like this could save up to 50% off its
long distance phone bill.
Why does VoIP support new emerging technologies better than
the PSTN?
An inherent limitation
with the PSTN is that intelligence resides in telephone company Central
Offices (CO) and corporate PBX's to. The technology in those systems
is highly reliable but changes are slow and expensive to make. In
contrast, IP architecture uses networks of servers and routers that
are rapidly escalating in power and frequent introductions of new
software that offers new functionality and features. High-end routers
can process more information at a fraction of the cost and physical
size of a traditional CO switch.
How are companies deploying VoIP technology?
VoIP technologies
are available as complete turnkey solutions or as incremental add-ons
that work with both the existing telephone and data equipment in place.
The benefits of VoIP are very attractive and many corporations are
exploring this technology to examine how it can benefit them. Adoption
is likely to be slow because corporations already have significant
investments in highly reliable telephone equipments and all companies
consider telecommunications to be mission critical. Surprisingly,
it is the under 100-user market that is leading the charge in installing
turnkey VoIP systems. For companies shopping for phone systems, the
enormous number of integrated capabilities is very attractive.
Comparing with traditional PSTN calls, will I notice the difference
when talking with VoIP service users?
When Internet
condition is stable, you can hardly tell when you use VoIP service
to make a call. Some ISPs provide better internet quality than others.
For the most amazing voice quality/clarity, you can ask our vendor
for suggestions on the best available quality ISP.
It seems like VoIP works for individual and large companies,
can small and medium size companies use VoIP?
There are a variety
of VoIP products that are aimed at helping small and medium size companies
that start at 2 ports and up and come in stackable modules.
How easily can existing data networks accommodate voice traffic?
A Some modifications
and changes are required because voice transmissions must take place
real time and must have priority in routing or users will experience
the same kind of problems described earlier that narrow band PC Telephony
users face, delay, latency and jitter. If however, voice and data
traffic are not carefully designed and monitored, growing voice demand
can rob data users of the network capacity that they need.
What is the quality of the connections?
The quality is
good - it can be described as higher quality than GSM cellular network
connections, but a bit lower than land line connections
What is VOIP technology?
Voice Over Internet
Protocol is a technology that voice conversations are digitized inside
of IP packets and transported over a data network. The main difference
is that the PSTN (public switched telephone network) we have been
using for years allows only one caller per channel and VOIP allows
many callers per channel. The major international long distance carriers
are making plans to move their traffic to VOIP networks . Again the
reason is simple, lower costs for the carriers and the consumer. The
call quality is the same and that is why VOIP technology is rapidly
gaining market share as it is the future of the industry.
What is the Voice quality?
Many people associate
VOIP with PC-to-PC services such as Netmeeting and net2phone. These
types of computer based VOIP services typically have voice quality
problems due to Internet congestion, as well as sound card and microphone
incompatibilities. Our network offers voice quality comparable to
regular land-line services.
Just to be clear… do I need a computer to use the VoIP?
No. you need
only our VoIP gateway.
What
do network conditions effect voice quality?
VoIP quality
is subject to the following network condition during the transmissions:
Bandwidth - Each VoIP call has its average and minimum requirements
on bandwidth usage. If IP network bandwidth cannot support the minimum
requirement on bandwidth, the voice quality will not be good, or the
voice will be dropped. The IP network must meet these minimum bandwidth
required to establish and maintain the call.
Delay - Delay of VoIP transmission will cause interaction difficulty
between the caller and called parties.
Packet Loss - IP networks breaks large blocks of data into smaller
chunks called "packets". These individual packets, to a
certain extent, will be lost due to transmission delay and/or poor
transmission quality. Voice will be distorted at the destination because
of sever packet loss.
Jitter - If an IP network produces various latency for different packets,
it introduces jitter, which is the different latency between two continuous
packets. Sever jitter will cause distortion of voice