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IP dialing
About unregistered endpoints
An unregistered endpoint is any device that is
not registered with an H.323 gatekeeper or SIP
Registrar (e.g. VCS, gatekeeper or TANDBERG
Border Controller). Although most calls are
made between endpoints that are registered
with such systems, it is sometimes necessary
to place a call to an unregistered endpoint.
There are two ways to call to an unregistered
endpoint:
•
by dialing its URI. This requires that the
local VCS has been configured to support
URI dialing, and that a DNS record exists for
that URI that resolves to the unregistered
endpoint's IP address.
•
by dialing its IP address.
The remainder of this section describes how
the VCS can be configured to handle calls
placed by dialing an endpoint's IP address.
Overview and
Introduction
Getting started
status
D14049.05
February 2009
Overview
Although the VCS supports dialing by IP
address, it is sometimes undesirable for a
VCS to be allowed to place a call directly to an
IP address that is not local. Instead, you may
want a neighbor to place the call on behalf of
the VCS, or not allow such calls at all. The VCS
allows you to configure how it will behave when
receiving a call for an IP address that is not
local. This is done from the
Calls to Unknown
IP addresses
setting.
To configure this setting from the web interface,
go to the
Calls
page
(VCS configuration >
Calls).
To configure this setting from the CLI:
•
xConfiguration Call Services
CallsToUnknownIPAddresses
About unknown IP addresses
The VCS considers an IP address to be "known"
if it either:
•
is the IP address of a locally registered
endpoint
•
falls within the IP address range of one of the
subzones configured on the VCS.
Calls to these IP addresses are not affected by
the
Calls to Unknown IP addresses
setting - the
VCS will always attempt to place the call.
All other IP addresses are considered to be
"unknown" and will be handled by the VCS
according to its
Calls to Unknown IP addresses
setting.
System
VCS
Zones and
configuration
configuration
neighbors
Calls to unknown IP addresses
Configuration
The options for the
Calls to Unknown
IP addresses
setting are:
Direct
The VCS will attempt to place the call directly to
the unknown IP address without querying any
neighbors.
Indirect
The VCS will forward the search request to its
neighbors in accordance with its normal search
process, i.e. any zones with an Always Match
will be queried in order of priority. If a match is
found and the neighbor's configuration allows it
to connect a call to that IP address, the VCS will
pass the call to that neighbor for completion.
Off
The VCS will not attempt to place the call, either
directly or to any of its neighbors.
If the IP address either belongs to a
locally registered endpoint, or falls within
the IP address range of one of the
subzones configured on the VCS, the VCS will
always attempt to place the call regardless of
the
Calls to Unknown IP addresses
Call
Bandwidth
processing
control
116
TANDBERG
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Recommended configuration for firewall
traversal
When the VCS Expressway is neighbored with
an VCS Control for firewall traversal, you should
typically set
Calls to unknown IP addresses
to
Indirect
on the VCS Control and
the VCS Expressway. When a caller inside the
firewall attempts to place a call to an IP address
outside the firewall, it will be routed as follows:
1.
The call will go from the endpoint to the VCS
Control with which it is registered.
2.
Since the IP address being called is not
registered to that VCS, and its
unknown IP addresses
VCS will not place the call directly. Instead,
it will query its neighbor VCS Expressway to
see if that system is able to place the call on
the VCS Control's behalf.
3.
The VCS Expressway receives the call and
since its
Calls to unknown IP addresses
setting is Direct, it will make the call directly
to the called IP address.
setting .
Firewall
Applications
Maintenance
traversal
ADMINISTRATOR GUIDE
Direct
on
Calls to
setting is Indirect, the
Appendices
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