VoIP
problems
Voice Delay -
Internet telephony protocols
facilitate the design and
interaction of the voice signals
over the IP network, but since IP
telephony lacks a mechanism that
facilitates delivery of data
packets in their intended order,
users of Internet telephony
services may experience lag. One
way to reduce these barriers is
by ensuring enough end-to-end
bandwidth to guarantee
low-latency, high-quality voice.
Private networks are less likely
to face this issue than users on
consumer Internet links with less
than 256 kbit/s bandwidth.
Minimizing packet latency to an
acceptable level can also be
difficult because of transmission
distances.
VOIP Hardware -
The hardware necessary for
Internet telephony is not as
widespread as legacy digital
ports. However, industry experts
believe that 2005 is the year of
inflection for IP ports, because
more IP PBX ports are expected to
ship than legacy digital PBX
ports. The deployment of this
equipment may be paving the way
toward Internet telephony
ubiquity.
Downtime - Since
Internet telephony is not a
standardized utility like
traditional telephone service, in
the event of a power failure
Internet telephony service would
probably be disconnected until
the power source returns.
Traditional telephones are
powered by phone lines kept live
during power failure by back-up
generators or batteries located
at the telephone exchange.
Internet telephony hardware, on
the other hand, uses broadband
modems and other equipment
powered by household electricity,
which is subject to outages. To
use VOIP during a power outage,
an uninterruptible power supply
or a generator must be installed
on premises.
Reliable VoIP -
Broadband connections often have
less than desirable reliability.
If IP packets are lost or slowed
at any time between Internet
telephony users, then the users
will notice a momentary drop-out
of voice. Highly trafficked
networks, long distances, and
interworking between end points
could each contribute to a lost
or delayed packet and a momentary
lapse in communication.
The latest on Internet telephony
is in FierceVoIP, a free
twice-weekly email service that
compiles news and expert opinions
IP telephony.
Routing - A
second challenge for VOIP
providers is traversing certain
firewalls and network address
translation, which is a technique
in which the source and/or
destination addresses of IP
packets are rewritten as they
pass through a router or firewall
. Middleware called “session
border controllers” are used
to overcome this challenge,
though some providers like Skype,
traverse firewall and NAT by
using subscribers’ computers
as super node servers to route
other’s calls.
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