Dialing By Address Types; About The Different Address Types; Dialing By Ip Address; Endpoints Registered To A Vcs Expressway - TANDBERG D14049.04 Administrator's Manual

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Dialing by address types

About the different address types

The destination address that is entered using the caller's endpoint can take a number of different
formats, and this will affect the specific process that the VCS follows when attempting to locate the
destination endpoint. The address types supported by the VCS are:
IP address e.g. 10.44.10.1 or 3ffe:80ee:3706::10:35
•
H.323 ID e.g. john.smith or john.smith@example.com (note that an H.323 ID can be in
•
the form of a URI)
E.164 alias e.g. 441189876432 or 6432
•
URI e.g. john.smith@example.com
•
ENUM e.g. 441189876432 or 6432
•
Each of these address types may require some configuration of the VCS in order for them to be
supported. The following sections describe the configuration required for each address type.

Dialing by IP address

Dialing by IP address is necessary when the destination endpoint is not registered with any system
(such as a VCS, gatekeeper or Border Controller).
If the destination endpoint is registered with one of these systems, it may be possible to
call it using its IP address but the call may not succeed if the endpoint is on a private
network or behind a firewall. For this reason we recommend that, where possible, calls to
registered endpoints are placed using one of the other address types, such as its AOR or
H.323 ID. For the same reason we do not recommend that callers outside your network are given IP
addresses to use to contact endpoints within your network
The Calls to Unknown IP addresses setting determines how the VCS will handle calls made to IP
addresses which are not on its local network, or registered with it or one of its neighbors. See the
Calls to unknown IP addresses section for full details on this setting.

Endpoints registered to a VCS Expressway

Calls made by dialing the IP address of an H.323 endpoint registered directly with a VCS
Expressway will be forced to route through the VCS Expressway. The call will therefore be subject to
any restrictions configured on that system.
Overview and System
Introduction
status configuration
D14049.07
March 2010
VCS Zones and Clustering and
configuration neighbors peers

Dialing by H.323 ID or E.164 alias

No special configuration is required to place a call using an H.323 ID or E.164 alias. The VCS
follows the usual search process, applying any transforms and then searching the Local Zone and
external zones for the alias, according to the search rules.
SIP endpoints will always register using an AOR in the form of a URI. We recommend
!
that H.323 endpoints also register with an H.323 ID in the form of a URI to facilitate
interworking.

Dialing by H.323 or SIP URI

When a user places a call using URI dialing, they will typically dial name@example.com.
If the destination endpoint is locally registered or registered to a neighbor system, no special
configuration is required for the call to be placed. The VCS follows the usual
applying any transforms and then searching the Local Zone and external zones for the alias,
according to the search rules.
If the destination endpoint is not locally registered, URI dialing may make use of DNS to locate the
destination endpoint. To support URI dialing via DNS, you must configure the VCS with at least one
DNS server and at least one DNS zone.
Full instructions on how to configure the VCS to support URI dialing via DNS (both outbound and
inbound) are given in the URI dialing
ENUM dialing allows an endpoint to be contacted by a caller dialing an E.164 number - a telephone
number - even if that endpoint has registered using a different format of alias. The E.164 number is
converted into a URI by the DNS system, and the rules for URI dialing are then followed to place the
call.
The ENUM dialing facility allows you to retain the flexibility of URI dialing whilst having the simplicity
of being called using just a number - particularly important if any of your callers are restricted to
dialing using a numeric keypad.
In order to support ENUM dialing on the VCS you must configure it with at least one DNS server and
the appropriate ENUM zone(s).
Full instructions on how to configure the VCS to support ENUM dialing (both outbound and inbound)
are given in the ENUM dialing section.
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Dialing by ENUM

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Applications Maintenance
traversal
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Appendices