About VoIP
About Us and the VoIP
A major development starting in 2004 has been the introduction of mass-market VoIP services over broadband Internet access services, in which subscribers make and receive calls as they would over the PSTN. Full phone service VoIP phone companies provide inbound and outbound calling with Direct Inbound Dialing. Many offer unlimited calling to the U.S., and some to Canada or selected countries in Europe or Asia as well, for a flat monthly fee.
These services take a wide variety of
forms which can be more or less similar to traditional POTS.
At one extreme, an analog telephone adapter (ATA) may be
connected to the broadband Internet connection and an
existing telephone jack in order to provide service nearly
indistinguishable from POTS on all the other jacks in the
residence. This type of service, which is fixed to one
location, is generally offered by broadband Internet
providers such as cable companies and telephone companies as
a cheaper flat-rate traditional phone service. Often the
phrase "VoIP" is not used in selling these services, but
instead the industry has marketed the phrase "Internet
Phone" or "Digital Phone" which is aimed at typical phone
users who are not necessarily tech-savvy. Typically, the
provider touts the advantage of being able to keep one's
existing phone number. According to a study by Telephia, the
top ten providers in the United States include Vonage,
Verizon VoiceWing, AT&T CallVantage, SunRocket, Lingo,
NetZero, BroadVoice, America Online, Packet8, and Earthlink.
Verizon VoiceWing and AT&T CallVantage are both listed in
second place with 5.5% market share.
At the other extreme are services like Gizmo Project and
Skype which rely on a software client on the computer in
order to place a call over the network, where one user ID
can be used on many different computers or in different
locations on a laptop. In the middle lie services which also
provide a telephone adapter for connecting to the broadband
connection similar to the services offered by broadband
providers (and in some cases also allow direct connections
of SIP phones) but which are aimed at a more tech-savvy user
and allow portability from location to location. One
advantage of these two types of services is the ability to
make and receive calls as one would at home, anywhere in the
world, at no extra cost. No additional charges are incurred,
as call diversion via the PSTN would, and the called party
does not have to pay for the call. For example, if a
subscriber with a home phone number in a U.S. area code
calls someone else in his home area code, it will be treated
as a local call regardless of where that person is in the
world. Often the user may also select a phone number with
any desired area code; this is generally done to minimize
the phone tariffs of those who frequently call.
For some users, the broadband phone complements, rather than
replaces, a PSTN line, due to a number of inconveniences
compared to traditional services. VoIP requires a broadband
Internet connection and, if a telephone adapter is used, a
power adapter is usually needed. In the case of a power
failure, VoIP services will generally not function.
Additionally, a call to the U.S. emergency services number
9-1-1 may not automatically be routed to the nearest local
emergency dispatch center, and would be of no use for
subscribers outside the U.S. This is potentially true for
users who select a number with an area code outside their
area. Some VoIP providers offer users the ability to
register their address so that 9-1-1 services work as
expected.
Another challenge for these services is the proper handling
of outgoing calls from fax machines, TiVo/ReplayTV boxes,
satellite television receivers, alarm systems, conventional
modems or FAXmodems, and other similar devices that depend
on access to a voice-grade telephone line for some or all of
their functionality. At present, these types of calls
sometimes go through without any problems, but in other
cases they will not go through at all. And in some cases,
this equipment can be made to work over a VoIP connection if
the sending speed can be changed to a lower bits per second
rate. If VoIP and cellular substitution becomes very
popular, some ancillary equipment makers may be forced to
redesign equipment, because it would no longer be possible
to assume a conventional voice-grade telephone line would be
available in almost all homes in North America and
Western-Europe. The TestYourVoIP website offers a free
service to test the quality of or diagnose an Internet
connection by placing simulated VoIP calls from any
Java-enabled Web browser, or from any phone or VoIP device
capable of calling the PSTN network.
http://financeservices4.googlepages.com/
Compare Free Cell
Phones
Top Cell Phone Models
Top Cell Phone Plans
Cell
Phone Accessories
Tours Solutions
Design
Cheap mp3 players