Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
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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.
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.
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.
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.
Expressway.
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.
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:
endpoints to be reachable using URI dialing either:
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Cisco TelePresence Video Communication Server Administrator Guide