Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
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Direct: the VCS attempts to place the call directly to the unknown IP address without querying any neighbors.
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Indirect: the VCS forwards the search request to its neighbors in accordance with its normal search process,
meaning any zones that are the target of search rules with an Any IP Address mode. 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.
meaning any zones that are the target of search rules with an Any IP Address mode. 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.
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Off: the VCS will not attempt to place the call, either directly or indirectly to any of its neighbors.
The default setting is Indirect.
This setting applies to the call's destination address prior to any zone transforms, but after any pre-search transforms,
Call Policy or User Policy rules have been applied.
Call Policy or User Policy rules have been applied.
Note that in addition to controlling calls, this setting also determines the behavior of provisioning and presence
messages to SIP devices, as these messages are routed to IP addresses.
messages to SIP devices, as these messages are routed to IP addresses.
Calling unregistered endpoints
An unregistered endpoint is any device that is not registered with an H.323 gatekeeper or SIP registrar. 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.
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:
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by dialing its URI (this requires that the local VCS is configured to support URI dialing, and a DNS record exists
for that URI that resolves to the unregistered endpoint's IP address)
for that URI that resolves to the unregistered endpoint's IP address)
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by dialing its IP address
Recommended configuration for firewall traversal
When a VCS Expressway is neighbored with a VCS Control for firewall traversal, you should typically set Calls to
unknown IP addresses to Indirect on the VCS Control and Direct on 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:
unknown IP addresses to Indirect on the VCS Control and Direct on 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.
As the IP address being called is not registered to that VCS, and its Calls to unknown IP addresses setting is
Indirect, the 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. Note that you need to configure a search rule
for Any IP Address against the traversal server zone.
Indirect, the 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. Note that you need to configure a search rule
for Any IP Address against the traversal server zone.
3.
The VCS Expressway receives the call and because its Calls to unknown IP addresses setting is Direct, it will
make the call directly to the called IP address.
make the call directly to the called IP address.
About 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.
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
destination endpoint is also locally registered, or is accessible via a neighbor system. This is because these endpoints
would be located using the
, 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.
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.
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Cisco TelePresence Video Communication Server Administrator Guide
Dial Plan and Call Processing