Dialogic 1000Series, User Manual

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30 Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide
Overview
Both the serial interface and the selection of which serial protocol to use are configurable using the
Web interface. Refer to
Chapter 3, “Parameter Reference” for information about configuring the
serial interface and serial protocols.
1.2 Call Routing in Phone Emulating Mode
The Media Gateway routes calls from the Switch network to a VoIP destination on the IP network.
Conversely, it routes calls from the IP network through a Switch port to a destination telephone
number on the Switch network. The Media Gateway supports the following call routing options:
• User configurable list of VoIP Servers
• IP load Balancing
• IP Fault Tolerance
In its simplest form, call routing is supported by configuring a single VoIP Server to receive and/or
originate calls through the Media Gateway. In this manner, all inbound Switch-to-IP calls will be
sent to the single user configured VoIP endpoint. For IP-to-Switch calls, the telephony port will be
selected in a round robin fashion – where each IP-to-Switch call will be routed to the next available
telephony port.
If the user configures more than one VoIP Server to receive and/or originate calls through the
Media Gateway, then the user has the option to have the incoming Switch-to-IP calls load balanced
between the configured VoIP Servers. Specifically, incoming Switch calls will be routed to a VoIP
server in a round-robin fashion. For example, if there are three (3) VoIP Servers configured, the
first call will be routed to the first VoIP server, the second call will be routed to the second VoIP
server, the third call will be routed to the third VoIP server. The next call will be routed to the first
VoIP Server and the process will start all over again. IP-to-Switch calls are handled in the same
way when multiple VoIP Servers are configured as when only a single VoIP server is configured
(e.g. in a round robin fashion).
If the user configures more than one VoIP Server to receive and/or originate calls through the
Media Gateway, then the user has the option to support fault tolerance on the incoming Switch-to-
IP calls. Specifically, if the VoIP server fails to respond to incoming Switch call (or responds with
an error), the Media Gateway will route the call to the next VoIP Server in the user configurable list
of VoIP Servers.
Note: If both IP Load Balancing and Fault Tolerance are enabled, then incoming IP-to-Switch calls will
be routed to the configured VoIP Servers in a round robin fashion and, if at any time a VoIP Server
fails to respond or responds with any error, the Media Gateway will route the call to the next
available VoIP Server.
1.2.1 Un-Routable Calls
A call is un-routable by the Media Gateway if the unit is unable to route the call to the other
network. This may occur if there is insufficient destination address information to determine a
destination for the call, or if there are not enough free resources on the Media Gateway to route the
call. The Media Gateway provides a number of different ways to handle these conditions in order to
insure that no calls are dropped or not completed.