22 IP-to-IP Routing Overview
This section describes configuration of the Gateway and IP-to-IP applications. The
Gateway application refers to IP-to-Tel (PSTN) call routing and vice versa. The IP-to-IP
application refers to call routing of calls received from the IP and forwarded to an IP
destination. For a description of the IP-to-IP application, see IP-to-IP Routing Application
on page 259.
Notes:
• In some areas of the Web interface, the term "GW" and "IP2IP"
application refers to the Gateway and IP-to-IP applications, respectively.
• The terms IP-to-Tel and Tel-to-IP refer to the direction of the call relative
to the device. IP-to-Tel refers to calls received from the IP network and
destined to the PSTN/
to the device); Tel-to-IP refers to calls received from telephones
connected directly to the device's FXS ports or from the PSTN/PBX, and
destined for the IP network.
• FXO (Foreign Exchange Office) is the interface replacing the analog
telephone and connects to a Public Switched Telephone Network
(PSTN) line from the Central Office (CO) or to a Private Branch
Exchange (PBX). The FXO is designed to receive line voltage and
ringing current, supplied from the CO or the PBX (just like an analog
telephone). An FXO VoIP device interfaces between the CO/PBX line
and the Internet.
• FXS (Foreign Exchange Station) is the interface replacing the Exchange
(i.e., the CO or the PBX) and connects to analog telephones, dial-up
modems, and fax machines. The FXS is designed to supply line voltage
and ringing current to these telephone devices. An FXS VoIP device
interfaces between the analog telephone devices and the Internet.
The device's IP-to-IP application supports IP-to-IP VoIP call routing (or SIP Trunking). The
IP-to-IP call routing application enables enterprises to seamlessly connect their IP-based
PBX (IP-PBX) to SIP trunks, typically provided by Internet Telephony Service Providers
(ITSP). The device enables the enterprise to communicate with the PSTN network (local
and overseas) through the ITSP, which interfaces directly with the PSTN. Therefore, the
IP-to-IP application enables enterprises to replace the bundles of physical PSTN wires with
SIP trunks provided by ITSPs and use VoIP to communicate within and outside the
enterprise network using its standard Internet connection. At the same time, the device can
also provide an interface with the traditional PSTN network, enabling PSTN fallback in case
of IP connection failure with the ITSPs.
The device also supports multiple SIP Trunking. This can be useful in scenarios where if a
connection to one ITSP fails, the call can immediately be transferred to another ITSP. In
addition, by allowing multiple SIP trunks where each trunk is designated a specific ITSP,
the device can route calls to an ITSP based on call destination (e.g., country code).
In addition to providing VoIP communication within the enterprise's LAN, the device
enables the enterprise to communicate outside of the corporate LAN using SIP Trunking.
This includes remote (roaming) IP-PBX users, for example, employees using their laptops
to communicate with one another from anywhere in the world such as at airports.
The IP-to-IP application can be implemented by enterprises in the following example
scenarios:
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