PSTN
GSM
or
CDMA
Traditional PBX
GS8
Phones (analog or digital)
LAN
GS8
Mobile
Phone with
provider A
Provider
D
IP Phones
PC
IP PBX
Provider
C
Provider
B
PSTN
GSM
or
CDMA
analog
Traditional PBX
GS8
Application: Connection to Traditional PBX
The GS8 modular gateway can connect to a traditional
PBX to provide flexibility and low cost telephony calls. It
can connect with the FXS or FXO modules.
In the configuration shown in figure 3, the GS8 modular
gateway is connected to standard analog ports on the
PBX with an FXO module. The GSM or CDMA module or
modules are mapped to these analog circuits. The GS8
modular gateway appears to the PBX as subscriber exten-
sions. A call to the analog extension on the PBX will be
routed automatically to a mobile phone. This seamlessly
provides a mobile phone user with a wireless extension
on the PBX.
You can choose whether incoming calls are private or
public. A private call would be treated just like any exten-
sion call. The system can authenticate the caller and
either permit calls from only a specified mobile phone
or prompt the caller for a password. A public call would
be treated just like a call from the PSTN and always be
routed to the operator or automated attendant.
In the configuration shown in figure 4, the GS8 modular
gateway is connected to standard analog ports on the
PBX with an FXS module. The GSM or CDMA module or
modules are mapped to these analog circuits. The GS8
modular gateway appears like the PSTN (or central office)
to the PBX. Outgoing and incoming calls to the mobile
phone network can be treated identically to those to or
from the PSTN.
You can use LCR on the PBX to determine if a call from
the PBX should be routed to the GSM or CDMA network,
or to the PSTN network. Again, call forwarding configured
on the PBX can permit calls to a user to be automatically
routed to a mobile phone.
Application: Reduction of Multiple Mobile
Phones
In many parts of the world, there is fierce competition
among the authorized mobile phone operators. They may
charge little or nothing for calls to other phone numbers
in their network and charge much for calls to phones on a
competing network. This may force an executive to carry
multiple mobile phones and publish multiple mobile
phone numbers on his or her business card. Using the
GS8 modular gateway as shown in figure 5 the executive
now needs to carry only a single mobile phone.
The figure shows a GS8 modular gateway with four GSM
or CDMA modules. The modules are registered with
service providers ‘A’ to ‘D.’ The executive used to carry four
mobile phones and now carries a single mobile phone, in
this case the one registered with provider ‘A.’
(33 paginas)
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