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It's Easy
Just connect a
Quadro to your broadband Internet service (Ethernet or ADSL
or SDSL). The Quadro automatically configures itself. And
in minutes, you are able to make voice over IP calls for free.
Connect up to four ordinary phones into it, or assign four
PBX trunks so that your entire office or household can use
the Quadro. The voice quality through the Quadro's digital
signal processor (DSP) will almost always be better than using
your current long distance company. When there isn't a Quadro
device on the other end, you can still call free of charge
to any IP phone or computer. By using a VoIP gateway service,
you can talk long distance to anyone on the public phone network
for pennies per minute.
It's
Flexible
Up to
four FXO lines or three ISDN lines go to your local phone
company so you can make calls from home or on the road. When
you call from outside the office, Quadro's Caller ID recognizes
your mobile phone number and immediately authenticates your
access to the Quadro. Just dial your associate's extension
and the Quadro routes your call on the best route possible
either down the hall or around the globe.
Since
the Quadro also contains call forwarding and call routing
instructions, people who are out of the office can still be
reached automatically. New York, Los Angeles, London, Tokyo
or Buenos Aires, the world becomes your virtual office. Communications
has never been so inexpensive, flexible or convenient.
It's
Secure
Most Quadro
models have a lifeline safety feature in the event of power
failure. If power goes out, one phone immediately connects
to the public phone network for emergency services. The Quadro
has many PBX (Private Branch Exchange) features such as voice
mail, 3-way conferencing, call waiting, and call statistics
to name a few. The Quadro is also packed with an amazing array
of network features including a firewall and a virtual private
network (VPN) for secure, private voice and data communications.
It's
Inexpensive
The purchase
price of the Quadro is justified by the quantifiable cost
savings associated with all long distance and international
calls made through the Quadro. You will realize a quick payback
on your initial investment and, then, enjoy recurring cost
savings every time you use your Quadro.
No obsolescence.
No upgrades.
No maintenance fees.
No license fees.
Interfaces
A good
place to start is always with the back panel. The Quadro IP
PBXs offer connections for up to four phone lines (FXO) and
up to 16 phone extensions (FXS). The ISDN variants (2xi, 4xi,
4xia, 16xi and 16xis) deliver up to three ISDN ports in-stead
of the FXO ports. An Ethernet 10/100BASE-T port connects all
variants of Quadro to your local area network. One 10BASE-T
Ethernet port or one DSL port allow access to your wide area
network (WAN). But this review of Quadro interfaces does not
convey the power of the product or the abundance of diverse
missions it fulfills. The Quadro shapes network traffic by
prioritizing voice over data to ensure voice quality for VoIP
at all times. Internet connection sharing allows multiple
client side router network to utilize the same Quadro.
How
does the Quadro do it?
Although
using the Quadro is easy, it is supported by a very sophisticated
and complex system. Inside the Quadro device, two communications
infrastructures come together.
One infrastructure
is the traditional telephone network. The other is the Internet.
At the core of the Quadro is the Call Manager. It resides
on a CPU running Linux software.
The Call
Manager maintains state and interfaces with the FXS and FXO
ports to set up and terminate voice calls. The Call Manager
performs traditional telephony PBX functions such as call
hold, call transfer, and voice mail. The Call Manager also
sends voice streams through the digital signal processor for
voice compression.
Then,
voice streams are passed from the DSP to the CPU where IP
headers are added for routing via the Internet. Other IP applications
include DHCP and PPP, Network Address Translation (NAT), Network
Time Protocol (NTP) for clock synchronization, a WEB server
(HTTP) for configuration and monitoring, a Simple Mail Transfer
Protocol (SMTP) client, a firewall, Intrusion Detection System
(IDS), Domain Name Service (DNS), Virtual Private Network
(VPN) and a Session Initiation Protocol (SIP) agent for retrieval
of call routing information from public and private SIP servers.
Future
enhancements extend the Quadro with additional USB driver
support and VoATM (Loop Emulation Service or LES).
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