LAN
WAN
LAN
GS8
IP PBX
Main Office
Branch Office
GSM
or
CDMA
ITSP
LAN
PSTN
GS8
Normal Phone Service
IP Phones
PC
IP PBX
GSM
or
CDMA
analog
Analog
Phones
parts of the world. You can navigate the GS8 modular
gateway’s administration UI in English or Simplified
Chinese.
Application: Basic Use
Equipped with GSM and CDMA modules, the GS8
can connect your office phone system directly to the
mobile phone network. Depending on the calling plan
you have with your carrier, this could mean that calls
to the PSTN or other mobile phones cost nothing for
each call.
The configuration shown in the figure on the back
page permits the office to make and receive calls over
the mobile network instead of over the PSTN land line.
Some carriers offer free calls among a group of users. By
putting one of the SIM cards in the GS8, calls between
your remote users and the office will be free. Similarly,
some mobile phone carriers have very low cost rates for
international calls compared to an equivalent call on a
land line. By routing all international traffic over the GSM
or CDMA network, your company may have significant
savings.
The business can also choose to publish the mobile
phone number associated with the ports on the GS8
modular gateway. Callers using a mobile phone may be
able to call the company’s “mobile” number cheaper than
if they called the company’s land line phone number.
This will lead to increased business and customer satis-
faction.
Application: One Number for Executives
As an extension of the previous application, you can
use call forwarding on the PBX to automatically
route inbound calls to your mobile phone.
Depending on the PBX, you may be able to
do this selectively, based on the time of day,
day of week, or caller.
Then when the executive is not in the
office he or she can still receive calls directed to the office
phone. This is achieved without having to disclose the
executive’s mobile phone number to the caller. The call
is forwarded to the mobile phone automatically, with
minimal delay, and at no additional cost to the caller or
the business (depending on the calling plan).
Application: Extension to Other Offices
If you have branch offices, you can extend the calling
from those offices to be transmitted over one GS8 modu-
lar gateway, so you don’t need to have multiple gateways
in each office.
The configuration shown in figure 1 permits the remote
office to use the gateway at the main office thereby re-
ducing communications costs in that office, too.
Application: Use for Backup Communications
If you are using an IP PBX as the communications, and
that PBX is connected directly to an ITSP (internet tele-
phony service provider), you can use the GS8 modular
gateway to provide backup telephony in the event the
internet service fails.
The configuration shown in figure 2 shows an office
making and receiving its normal telephony with the ITSP.
If that service fails, calls can be routed through the GS8
modular gateway to the PSTN or mobile networks.
Alternatively, calls may be routed to the GS8 modular
gateway using a least cost routing (LCR) algorithm in your
PBX. This LCR determines whether a call should be routed
over the ITSP, the analog PSTN network, or over the GSM
or CDMA network. The LCR is programmed to compare
part or all of a dialled number against a list in a routing
table and can, for example, cause calls to a mobile phone
to be made from CDMA or GSM to mobile instead of land
line to mobile.
(33 paginas)
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