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URI dialing
A URI address typically takes the form name@example.com,
where name is the alias and example.com is the domain.
URI dialing can make use of DNS to enable endpoints registered
with different systems to locate and call each other. Without
DNS, the endpoints would need to be registered to the same or
neighbored systems in order to locate each other.
URI dialing without DNS
Without the use of DNS, calls made by a locally registered
endpoint using URI dialing will be placed only if the destination
endpoint is also locally registered, or is accessible via a neighbor
system. This is because these endpoints would be located using
the
zone search
process, rather than a DNS query.
If you want to use URI dialing from your network without the use
of DNS, you would need to ensure that all the systems in your
network were connected to each other by neighbor relationships
- either directly or indirectly. This would ensure that any one
system could locate an endpoint registered to itself or any
another system, by searching for the endpoint's URI.
This does not scale well as the number of systems grows. It is
also not particularly practical, as it means that endpoints within
your network will not be able to dial endpoints registered to
systems outside your network (for example when placing calls to
another company) if there is not already a neighbor relationship
between the two systems.
If a DNS zone and a DNS server have not been configured
on the local VCS, calls to endpoints that are not
registered locally or to a neighbor system could still be
placed if the local VCS is neighbored (either directly or indirectly)
with another VCS that has been configured for URI dialing via
DNS. In this case, any URI-dialed calls that are picked up by
search rules that refer to that neighbor zone will go via that
neighbor, which will perform the DNS lookup.
This configuration is useful if you want all URI dialing to be made
via one particular system, such as a VCS Expressway.
Overview and
System
Introduction
status
configuration
D14049.07
March 2010
Overview
If you do not want to use DNS as part of URI dialing within your
network, then no special configuration is required. Endpoints will
register with an alias in the form of a URI, and when calls are
placed to that URI the VCS will query its local zone and neighbors
for that URI.
If the VCS does not have DNS configured and your network
includes H.323 endpoints, then in order for these endpoints to
be reachable using URI dialing either:
•
the H.323 endpoints should register with the VCS using an
address in the format of a URI
•
an appropriate transform should be written to convert URIs
into the format used by the H.323 registrations. An example
would be a deployment where H.323 endpoints register with
an alias, and incoming calls are made to alias@domain.com.
A local transform is then configured to strip the @domain,
and the search is made locally for alias. See the
domain for dialing to H.323 numbers
how to do this.
SIP endpoints always register with an AOR in the form of a URI,
so no special configuration is required.
URI dialing via DNS
By using DNS as part of URI dialing, it is possible to find an
endpoint even though it may be registered to an unknown
system. The VCS uses a DNS lookup to locate the domain in the
URI address and then queries that domain for the alias.
The remainder of this section describes how to configure the VCS
to support URI dialing via DNS.
VCS
Zones and
Clustering and
configuration
neighbors
peers
Stripping @
section for an example of
Call
Bandwidth
processing
control
105
TANDBERG
VIDEO COMMUNICATION SERVER
Enabling URI dialing via DNS
URI dialing via DNS is enabled separately for outgoing and
incoming calls.
Outgoing calls
To enable your VCS to locate endpoints using URI dialing via
DNS, you must:
•
configure at least one DNS zone and an associated search
rule
•
configure at least one DNS server
This is described in the
URI dialing via DNS for outgoing calls
section.
Incoming calls
To enable endpoints registered to your VCS to receive calls from
non-locally registered endpoints using URI dialing via DNS, you
must:
•
ensure all endpoints are registered with an AOR (SIP) or
H.323 ID in the form of a URI
•
configure appropriate DNS records, depending on the
protocols and transport types you wish to use.
This is described in the
URI dialing via DNS for incoming calls
section.
Firewall traversal calls
To configure your system so that you can place and receive calls
using URI dialing through a firewall, see the
firewall traversal
section.
Firewall
Applications
Maintenance
traversal
ADMINISTRATOR GUIDE
URI dialing and
Appendices
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