While SS7 hums away keeping our networks running, the
convergence of IP and circuit-switched networks
continues moving forward. As discussed in November
2000's Industry Insight, SS7 is here to stay. It's
unifying the public switched telephone network (PSTN),
wireless networks, and IP networks. More companies are
offering Sigtran-compliant signaling gateways, as
successful bakeoffs continue ensuring interoperability.
In fact, SS7 has become instrumental in deploying
General Packet Radio Service (GPRS) to enable enhanced
wireless data support. Now it's time to look at the
Advanced Intelligent Network (AIN) and how it can work
with Internet telephony.
Today IP telephony only accounts for a small
percentage of voice calls. According to a TeleGeography
2001 report, international VoIP traffic is only expected
to be 3.7 billion minutes in 2001, while international
PSTN traffic is expected to be 124 billion minutes. The
VoIP opportunity is also shifting from the PSTN backbone
to the edge, since arbitrage is not as attractive as it
had been. Another trend to consider is the technology
market slump. Large telecom equipment manufacturers are
laying off thousands of employees, margins are being
squeezed, and everyone is looking for low-risk
opportunities. The bottom line? VoIP has many benefits,
which is why it will eventually win. But the road to
success won't be a straight one.
So why talk about "Recycling the AIN?" Recycling is
the art of reusing something, whether it's cardboard,
broken down and blended with new pulp to give it the
strength to be made into new cardboard, or turning an
old steam radiator from the 1930s into a piece of art.
Both these examples are recycling, and recycling is
good. Since the AIN exists today in the PSTN, the
quickest and most economical approach is to recycle
these services with the growing IP networks.
AIN separates the service logic from the switching
equipment with a key benefit of cutting both time to
market and development costs. This allows more
competition by giving service providers an easier way to
offer new value-added services. Switching equipment
doesn't need to be redesigned; and a switch is only
needed for the initial call. In the end, the customer
benefits from expanded service capabilities and choices,
along with a lower total cost of deployment.
While there are many examples of AIN, one that
provides a lot of value to retail outlets is the store
locator service. Businesses can advertise one number
(usually toll-free) from which callers are automatically
transferred to the nearest location based on their
telephone number (or the number from which they are
calling). Since a switch isn't intelligent, it can't
perform this function. However, once the business number
is dialed, the switch sends an SS7 query to the AIN
service platform, which matches the calling party number
to the nearest location in a database. The AIN platform
sends the correct routing information back to the
switch, which routes the call to the nearest location.
SIP promises many of the same capabilities as AIN. It
can decouple the address and a physical device, enabling
more intelligent call processing. It will allow users to
receive communications and services from any location.
Conversely, it will allow networks to identify and
locate users wherever they are. SIP does this by keeping
track of people and devices through a SIP server, which
contains information on how to communicate with someone
based upon the device they're currently using. For
instance, if you have only your wireless PDA turned on
because you're traveling, the SIP application can
determine this and negotiate the appropriate
communication method, it could also track you to your
computer if you were sitting in front of your laptop at
home. SIP will allow interaction and responses from
servers and databases -- the next round of service
control points (SCPs) used for AIN today.
SIP lacks a large embedded base of users, but that
isn't a problem. SS7 will allow SIP to reach the massive
circuit-switched market segment and make it possible to
use the AIN infrastructure already in place. SS7/IP
signaling gateways will enable this interaction, and
provide the communication path between the circuit and
IP networks. AIN will need to be recycled, or reused, to
make this successful. Simple transactions like 800
database dips, local number portability, alternate
destination on busy, and other AIN services don't need
to be recreated in an IP environment. We just need to be
certain that a VoIP call can reach and be reached by
these services. Integration needs to be a major
component of any VoIP and AIN deployment.
How does the economy factor in? The bubble has burst,
funds have disappeared, and some telecom companies are
in trouble. While it's hard to find any positives here,
there are a few. In today's down market, decisions will
be scrutinized. Instead of 20 companies deploying
competing standards, everyone will have an incentive to
deploy under one standard. This will also push service
providers to recycle the embedded investment they've
already made -- making the transition to new
technologies more cost effective. This should increase
the likelihood of success, since the economics of these
new services will be more favorable.
The AIN and SS7 have huge capabilities and support
most of today's circuit-switched traffic. The smart
money says they won't be thrown out and replaced anytime
soon. Wise decision makers will look to leverage the
existing infrastructure, deploy IP telephony where it
makes economic sense, and interoperate with the AIN.
Jim Machi is Director, Product Management for the Intel
Telecommunication and Embedded Group. The Intel
Telecommunication and Embedded Group develops advanced
communications technologies and products that merge data
and voice technologies into a single network.
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