Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
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 while 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.
using just a number - particularly important if any of your callers are restricted to dialing using a numeric keypad.
To support ENUM dialing on the VCS you must configure it with at least one DNS server and the appropriate ENUM
zones.
zones.
Full instructions on how to configure the VCS to support ENUM dialing (both outbound and inbound) are given in the
section.
Dialing by IP Address
Dialing by IP address is necessary when the destination endpoint is not registered with any system.
If the destination endpoint is registered, 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 you are recommended to place calls to
registered endpoints via other address formats, such as its AOR or H.323 ID. Similarly, callers outside of your network
should not try to contact endpoints within your network via their IP addresses.
if the endpoint is on a private network or behind a firewall. For this reason you are recommended to place calls to
registered endpoints via other address formats, such as its AOR or H.323 ID. Similarly, callers outside of your network
should not try to contact endpoints within your network via their IP addresses.
Calls to unknown IP addresses
Although the VCS supports dialing by IP address, it is sometimes undesirable for the VCS to be allowed to place a call
directly to an IP address that is not local. Instead, you may want a neighbor to place the call on behalf of the VCS, or
not allow such calls at all. The Calls to unknown IP addresses setting (on the
directly to an IP address that is not local. Instead, you may want a neighbor to place the call on behalf of the VCS, or
not allow such calls at all. The Calls to unknown IP addresses setting (on the
configures how the VCS handles calls made to IP addresses which are not on its local network, or registered with it or
one of its neighbors.
one of its neighbors.
The VCS considers an IP address to be "known" if it either:
■
is the IP address of a locally registered endpoint
■
falls within the IP address range of one of the subzone membership rules configured on the VCS
The VCS will always attempt to place calls to known IP addresses (providing there is a search rule for Any IP Address
against the Local Zone).
against the Local Zone).
All other IP addresses are considered to be "unknown" and are handled by the VCS according to the Calls to
Unknown IP addresses setting:
Unknown IP addresses setting:
■
Direct: the VCS attempts to place the call directly to the unknown IP address without querying any neighbors.
■
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.
■
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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Cisco TelePresence Video Communication Server Administrator Guide