PLANET Internet Telephony GatewayVoip-D.GIF (34794 bytes)

VIP-000

ITG Basic Unit Installation and Reference Guide


Typical Applications

This section discusses the various environments and situations where you can use the Internet Telephony Gateway. There are three basic environments that the gateway can be applied to. They are described in the following sections.

Before Startup

To start up your configuration, please be sure that you are using the correct modules.

Module

Connection

Purpose

FXS

End stations
Telephones, Fax machines

Provides the end stations direct call/receive from IP network

FXO

Voice switches
PBX, PSTN equipment

Provides the voice switch capability to call-in or dial-out via IP Network

The FXS interface (VIP-FXS) provides support for phone and fax end stations. The FXO interface (VIP-FXO) provides support for connections to voice switching equipment such as a PBX or PSTN. Any combination of FXS and FXO modules is available depending upon your configuration requirements.

The following three sections describe the combination of the modules and the application, you can also refer to Appendix B, Dial-Plan for more.

2.1 Application A: FXS

Application-A has two possible connections. The A-1 connection shows the connection between the gateway to telephone set (POTS) or FAX machine. The FXS module is used in the A-1 connection. The other connection A-2, on the right hand side, is used to connect the gateway and PBX that has the CO trunk interface. FXS is also used in this connection. The telephone sets connected to PBX can be either POTS or digital telephone depending upon the PBX capability. Please refer to Figure 3.

FXS
Figure
3 Application A: FXS


2.2 Application B: FXS/FXO combination

Application-B has three possible connections. The B-1 connection is a normal trunk connection between the CO switch and PBX. The B-2 connection is identical to the A-1 connection mentioned in Application A. The B-3 connection is used to connect the PBX and gateway through the internal analogue lines provided by the PBX. In this case, the FXO module has to be used, and the FXO ports will serve the same roles as the analogue telephone sets. Please refer to Figure 4.

Note: If the PBX used in the B-3 connection is a digital type, a certain analog terminal adapter is needed to provide an analog interface to the FXO module.

In this application, The caller in the B-2 connection can use the Gateway through its FXS module to communicate with the party on the other end in the B-3 connection. The phone call is forwarded through the FXS module in the B-2 Gateway and is received by the FXO module in the B-3 gateway, which is connected to the PBX, which will then switch to the dedicated terminal.
The same caller can also use the feature that the Gateway provides to redial the local number through the PBX, to the public switch, in order to reach the person inside the region that the public switch serves.

FXS/FXO Combination
Figure 4 Application B FXS/FXO Combination


2.3 Application C: FXS/FXO Extended Combination

Application-C has four possible connections. The C-1 connection is a normal trunk connection between the CO switch and PBX (identical to connection B-1 in the previous application.) The C-2 connection is identical to the A-1 connection mentioned in Application A. The C-3 connection connects the PBX and gateway through the internal analogue lines provided by the PBX (identical to the B-3 connection). The C-4 connection connects the CO switch to the gateway, in this connection the FXO module is also used (similar to the C-3 connection.) Please refer to Figure 5.
Of course, the C-2 connection can replace the C-3 connection, but it must then use an FXO module instead of an FXS module. In this application, the user can benefit from the VoIP application even when outside the office. With a proper dial plan setting, the user can make a phone call through a public switch back to the office, the PBX will relay the phone call to the other end which may be located in another city, state, or even country.
FXS/FXO Extended Combination

Figure 5 Application C FXS/FXO Extended Combination

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