Dialogic 1000Series, User Manual

Page: 31 / 326

Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide 31
Overview
1.2.1.1 IP to Switch Calls
There are a few circumstances where an inbound IP call may not be routed to the Switch network.
They are the following:
• No available Switch Ports
– There are no available Media Gateway Switch ports on which to carry the call.
• Invalid or No Switch destination address specified
– The IP call information does not contain a valid E.164 destination address for the Switch
network.
The administrator may specify a default destination IP address that is to receive any inbound IP
calls that cannot be routed to the Switch. If the administrator specifies a default destination IP
address for un-routable IP calls, then any inbound IP call that cannot be routed to the Switch
network is handled in the Routing Table as alternate routes.
1.2.1.2 Switch to IP Calls
There are a few circumstances in which an inbound Switch call may not be routed to the IP
network. They are the following:
• IP destination not configured.
• IP destination not present.
The administrator may specify a default destination Switch extension that is to receive any inbound
Switch calls that cannot be routed to the IP network. If the administrator specifies a default
destination Switch extension for un-routable Switch calls, then any inbound Switch call that cannot
be routed to the IP network is handled in the Routing Table as alternate routes.
1.3 Voice over IP Address Translation
The Voice over IP (VoIP) Address Translator provides network services to SIP devices such as the
Media Gateway. SIP devices register with the VoIP Address Translator to sent and receive SIP
calls.
The VoIP Address Translator can provide network services such as:
• Controlling the number and type of connections allowed across the network.
• Helping to route a call to the correct destination.
• Determining and maintaining the network address for incoming calls.
Without a VoIP Address Translator, all IP destination addresses must be specified to the Media
Gateway as IP v4 addresses (e.g. 10.10.4.128). IP terminal devices must also explicitly specify the
IP address of the Media Gateway as the desired gateway when originating PBX calls.
With a VoIP Address Translator, IP destination addresses may be specified to the Media Gateway
as e-mail addresses, alphanumeric aliases, E.164 telephone numbers, domain names, and any other
format supported by the VoIP Address Translator. IP terminal devices may explicitly specify the IP