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D14049.05
February 2009
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Introduction
Getting started
Overview and
status
System
configuration
VCS
configuration
Zones and
neighbors
Call
processing
Bandwidth
control
Firewall
traversal
Appendices
Applications
Maintenance
Registration control
Registration overview
Finding a VCS with which to register
Before an endpoint can register with a VCS, it must determine which VCS it can or should be
registering with. This setting is configured on the endpoint, and the process is different for SIP and
H.323.
SIP
SIP endpoints must find a SIP Registrar with which to register. The SIP Registrar maintains a
record of the endpoint’s details against the endpoint’s Address of Record (AOR). When a call is
received for that AOR, the SIP Registrar refers to the record in order to find the endpoint to which
it corresponds. (Note that the same AOR can be used by more than one SIP endpoint at the same
time.)
The SIP Registrar will only accept registrations for domains for which it is authoritative.
There are two ways a SIP endpoint can locate a Registrar with which to register: manually or
automatically. The option is configured on the endpoint itself under the SIP
Server Discovery
option
(consult your endpoint user guide for how to access this setting).
If the
•
Server Discovery
mode is set to automatic, the endpoint will send a REGISTER message to
its SIP Server. This will be forwarded (via DNS if necessary) to the Registrar that is authoritative
for the domain with which the endpoint is attempting to register. For example, if an endpoint
is attempting to register with a URI of
, the request will be sent to the
Registrar authoritative for the domain
example.com
.
If the
•
Server Discovery
mode is set to manual, the user must specify the IP address or FQDN of
the Registrar with which they wish to register, and the endpoint will attempt to register with that
Registrar only.
The VCS is a SIP Server for endpoints in its local zone, and can also act as a SIP Registrar.
If the VCS is acting as the endpoint’s SIP Server and SIP Registrar, when the registration request
•
is received from the endpoint it will be accepted by the VCS and the endpoint will be registered
and able to receive inbound calls. See
Using the VCS as a SIP registrar
for more information.
If the VCS is acting as the endpoint’s SIP server but is not a SIP Registrar, it will proxy the
•
registration request. See
Proxying registration requests
for more information.
H.323
There are two ways an H.323 endpoint can locate a VCS with which to register: manually or
automatically. The option is configured on the endpoint itself under the
Gatekeeper Discovery
setting (consult your endpoint manual for how to access this setting).
If the mode is set to automatic, the endpoint will try to register with any VCS it can find. It does
•
this by sending out a Gatekeeper Discovery Request, to which eligible VCSs will respond.
If the mode is set to manual, you must specify the IP address of the VCS with which you wish
•
your endpoint to register, and the endpoint will attempt to register with that VCS only.
Preventing automatic registrations
You can prevent H.323 endpoints being able to register automatically with the VCS by disabling
Auto
Discovery
on the VCS. This setting is accessed using:
VCS configuration > Protocols > H.323
•
.
You will be taken to the
H.323
page.
xConfiguration H323 Gatekeeper AutoDiscover
•
y
The
Auto Discovery
setting determines whether the VCS responds to the Gatekeeper Discovery
requests sent out by endpoints.
The options are as follows:
On
: The VCS will respond to Gatekeeper discovery requests.
Off
: The VCS will reject Gatekeeper discovery requests. H.323 endpoints will be able to register with
the VCS only if their
Gatekeeper Discovery
setting is
Manual
and they have entered the IP address
of the VCS.
