Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
include all Cisco TelePresence Expressway™ endpoints and third-party endpoints which support the ITU H.460.18
and H.460.19 standards.
and H.460.19 standards.
Endpoints that are not traversal-enabled can still register with a VCS Expressway, but they may not be able to make
or receive calls through the firewall successfully. This will depend on a number of factors:
or receive calls through the firewall successfully. This will depend on a number of factors:
■
whether the endpoint is using SIP or H.323
■
the endpoint’s position in relation to the firewall
■
whether there is a NAT in use
■
whether the endpoint is using a public IP address
For example, if an endpoint is behind a NAT or firewall, it may not be able to receive incoming calls and may not be
able to receive media for calls it has initiated. SIP endpoints can also work behind a NAT but can only receive video if
they send it as well.
able to receive media for calls it has initiated. SIP endpoints can also work behind a NAT but can only receive video if
they send it as well.
To ensure firewall traversal will work successfully for H.323 endpoints behind a NAT, the endpoint must be traversal-
enabled.
enabled.
MCU, Gateway and Content Server Registration
H.323 systems such as gateways, MCUs and Content Servers can also register with a VCS. They are known as locally
registered services. These systems are configured with their own prefix, which they provide to the VCS when
registering. The VCS will then know to route all calls that begin with that prefix to the gateway, MCU or Content
Server as appropriate. These prefixes can also be used to control registrations.
registered services. These systems are configured with their own prefix, which they provide to the VCS when
registering. The VCS will then know to route all calls that begin with that prefix to the gateway, MCU or Content
Server as appropriate. These prefixes can also be used to control registrations.
SIP devices cannot register prefixes. If your dial plan dictates that a SIP device should be reached via a particular
prefix, then you should add the device as a neighbor zone with an associated search rule using a pattern match equal
to the prefix to be used.
prefix, then you should add the device as a neighbor zone with an associated search rule using a pattern match equal
to the prefix to be used.
Note that the Cisco TelePresence MPS 200 and MPS 800, and the Cisco TelePresence Content Server both support
Expressway. They can therefore register directly with a VCS Expressway for firewall traversal.
Expressway. They can therefore register directly with a VCS Expressway for firewall traversal.
Configuring Registration Restriction Policy
The Registration configuration page (Configuration > Registration > Configuration) is used to control how the VCS
manages its registrations.
manages its registrations.
The Restriction policy option specifies the policy to use when determining which endpoints may register with the
VCS. The options are:
VCS. The options are:
■
None: any endpoint may register.
■
Allow List: only those endpoints with an alias that matches an entry in the Allow List may register.
■
Deny List: all endpoints may register, unless they match an entry on the Deny List.
■
Policy service: only endpoints that register with details allowed by the external policy service may register.
The default is None.
The Policy service option is used if you want to refer all registration restriction policy decisions out to an external
service. If you select this option an extra set of configuration fields appear so that you can specify the connection
details of the external service. See
service. If you select this option an extra set of configuration fields appear so that you can specify the connection
details of the external service. See
.
Registering Aliases
process (if required) has been completed, the endpoint will then attempt to register its
aliases with the VCS.
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Cisco TelePresence Video Communication Server Administrator Guide
Registration Control