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Registration Control
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About Alias Registration
Once the authentication process (if required) has been
completed, the endpoint will then attempt to register its
alias(es) with the VCS.
H.33 Alias Registration
When registering, the H.323 endpoint presents the VCS with
one or more of the following:
•
one or more H.323 IDs
•
one or more E.164 aliases
•
one or more URIs.
Users of other registered endpoints can then call the endpoint
by dialing any of these aliases.
We recommended that you register your H.323
endpoints using a URI. This facilitates interworking
between SIP and H.323, as SIP endpoints register using
a URI as standard.
We recommended that you do not use aliases that
reveal sensitive information. Due to the nature of
H.323, call setup information is exchanged in an
unencrypted form.
SIP Alias Registration
When registering, the SIP endpoint presents the VCS with its
contact address (IP address) and logical address (Address of
Record). The logical address is considered to be its alias, and
will generally be in the form of a URI.
Getting
System
Introduction
Started
Overview
D 14049.01
07.2007
Registering Aliases
Attempts to Register using an Existing Alias
An endpoint may attempt to register with the VCS using an alias
that is already registered to the system. How this is managed
depends on how the VCS is configured and whether the
endpoint is SIP or H.323.
H.33
An H.323 endpoint may attempt to register with the VCS using an alias that has already been registered on the VCS from another IP
address. The reasons for this could include:
•
two endpoints at different IP addresses are attempting to register using the same alias
•
a single endpoint has previously registered using a particular alias. The IP address allocated to the endpoint then changes, and
the endpoint is attempting to re-register using the same alias.
You can determine how the VCS will behave in this situation by configuring the
•
VCS Configuration > Protocols >
•
xConfiguration H323 Gatekeeper Registration ConflictMode: <Reject/Overwrite>
System
H.323 & SIP
Registration
Registration
Configuration
Configuration
Control
Control
SIP
A SIP endpoint will always be allowed to register using an alias
that is already in use from another IP address. When a call is
received for this alias, all endpoints registered using that alias
will be called simultaneously. This SIP feature is known as
"forking".
H.323. You will be taken to the
H.323
Zones and
Call
Neighbors
Processing
45
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ADMINISTRATOR GUIDE
ADMINISTRATOR GUIDE
Registration Conflict
Mode. This is done via:
page.
Registration conflict mode
Determines what will happen when an H.323
endpoint attempts to register using an alias
that has already been registered from another
IP address.
Reject:
The registration from the new IP
address will be rejected. This is useful if your
priority is to prevent two users registering with
the same alias.
Overwrite:
The existing registration will be
overwritten using the new IP address. This is
useful if your network is such that endpoints
are often allocated new IP addresses,
because it will prevent unwanted registration
rejections.
The default is Reject.
Firewall
Bandwidth
Maintenance
Traversal
Control
Appendices
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